Just before lunch, Mr Sherrard QC pressed Mr Coyle further on the two people who came into the park earlier and sat on the bench next to the group.

Mr Coyle agreed they had been there for about half an hour or more.

At the time of his police statement he told police the taller man was wearing a black puffer jacket.

But earlier in court today he said the jacket was white.

The witness was asked by Mr Sherrard whether there might be any "confusion" due to any alcohol or weed taken that night, the sheer shock of what happened or indeed the effect of the group trying to piece events together.

"Do you think there is any confusion in what people looked like and were wearing," asked Mr Sherrard.

"No," said Mr Coyle.

"In part due to weed and alcohol?"

"No", replied Mr Doyle.

Asked again if the first male was taller, and wearing a white puffer jacket, Mr Coyle replied "Yes."

The jury has left Court 8 to go and get some lunch.

We'll do the same and be back for more live updates at 14:00 where Eddie Coyle will continue to give his evidence.

Image source, PA Media

Mr Coyle tells jurors that any drug deals involving cannabis would not happen inside the park, but on the outskirts.

Mr Sherrard asks if Bryce Henderson was the one in the group of friends "who would normally share the stuff around?"

"Yes," Mr Coyle replies. "He'd buy and we'd sometimes chip in to give him the money."

The 18-year-old adds that Bryce had been part of the group of friends for around a year.

Mr Coyle says he was aware of someone called 'Spencer' as the person Bryce was trying to get cannabis from.

Mr Sherrard asks: "Were you aware that he tried another supplier?"

"Yes," Mr Coyle replies.

"Are you familiar with the name Jade?"

Mr Coyle says yes, again.

Prosecutor Crispin Aylett QC has finished his first round of questions.

Manuel Petrovic's defence barrister, Sarah Forshaw QC, has asked a couple of questions and now Charlie Sherrard QC - representing Svenson Ong-a-Kwie - has started his cross-examination.

Mr Aylett has started to ask Mr Coyle about the appearance of the men who ran into Amy's Park.

Refering to the "taller man", Mr Coyle adds: "He had quite large nostrils.

"He was wearing all black.

"Black jogging bottoms. Black puffer jacket and a hood slightly wrapped around his face."

Mr Aylett then finishes his questions by asking about the type of person Jodie was.

"She was a great person," Mr Coyle responds, smiling, "Very funny - sensible sometimes!"

Mr Aylett then asks: "Can you think of any reason why anyone would hurt her?

"No," Mr Coyle replies.

Image source, PA Media

Describing the emergency service response, Mr Coyle says the police arrived first and then the paramedics.

"It must have been about 15 minutes," Mr Coyle says.

Mr Aylett asks: "That must have felt like an eternity?"

"Yes," Mr Coyle replies.

He then tells jurors Jodie was put on a stretcher and taken away in the ambulance, adding that he was then taken to Ilford police station.

After being stabbed in the back, Mr Coyle tells jurors that Jodie started to scream and had no idea what had happened.

"I thought they were going to punch her," he says.

"She was in shock at first. She didn't know what happened, she just started screaming. Continuously, very loudly for two minutes.

"Then she fell faint and fell off the bench. I was trying to catch Jodie.

"I put her on the floor, she was wearing a thick jacket and we didn't know how bad the wound was.

"But, there was a lot of blood. After I cried out for help for three or four minutes, two neighbours came out."

Image source, PA Media

Mr Coyle has started to talk about the moments before Jodie was stabbed, as the friends sat smoking, drinking and socialising in the park.

"I was standing in front of her.

"I saw two men walk towards us from the side entrance. I couldn't really hear them.

"They were about 5m away and still on the grass.

"They got close to the gate, both of them started running.

"One hopped the fence towards us, I think the other one went through the gate. The taller one hopped the gate, the shorter one went through it.

"The taller one and the shorter one both came right up behind Jodie.

"The taller one swung his arm out and stabbed Jodie in the back."

Mr Coyle has stood up in the dock, gesturing the movement the stabber made when attacking Jodie.

One of their friends, Bryce Henderson, was able to get hold of some cannabis so the group could "smoke a joint," Mr Coyle has said.

He adds: "The area is not well lit, we usually put our phones on for some light."

Mr Coyle says "two men came into the park" about an hour after the group of friends arrived but there was no exchanges between them.

"They sat on the benches behind us," Mr Coyle says, "About five feet away.

"I did not recognise them, I could tell what they were wearing.

"One was wearing a white puffer jacket, the other was dressed all in black.

"They were late teens or early 20s.

Mr Coyle said the atmosphere was "tense" having strangers behind them.

Image source, PA Media

Mr Coyle has told jurors he met Jodie Chesney at Havering Sixth Form College and that the pair had been going out for around three months before she was killed.

The 18-year-old has been outlining the movements he, Jodie and their friends took on 1 March.

He said: "We met at Romford railway station at about 17:00 or 18:00. We took the 174 bus straight to St Neots Road.

"We were going to sit down, chill out, listen to music, have a couple of fags."

Mr Aylett asks: "Have you done that in the past?"

Mr Coyle responds: "Yes."

Eddie Coyle is seated in the witness box, has taken the oath and is now facing the first set of questions by prosecutor Crispin Aylett QC.

This case is generating much media interest and the press bench is now full.

The jury and defendants are about to re-enter the courtroom.

The public gallery is also well attended with members of Jodie's family there including her father.

Danny Shaw
BBC Home Affairs Correspondent

During court hearings, some witnesses are allowed by the judge to give their evidence without being present in court or without being seen by everyone in court.

In such cases, 'special measures' are introduced which might involve a witness testifying from behind a screen so only the judge, jurors and barristers can see them, or by video-link from somewhere outside the courtroom.

The central purpose of 'special measures' is to make it less stressful for witnesses to give their evidence.

The measures can be applied to witnesses for either side - the prosecution and the defence - and the kind of cases in which they can be used are set out in guidance by the Crown Prosecution Service.

They include trials in which people allege they have witnessed serious violence or been the victim of a sexual offence.

Those who are assessed as 'vulnerable' - if they're under 18, have a mental health problem or disability - may also be permitted to testify from behind a screen or by video-link.

A variety of other types of 'special measures' are also available, such as hearing evidence without the public being present - but this is applied less often.

Eddie Coyle, who was dating the 17-year-old at the time of her death, is due to give evidence at the Old Bailey.

Mr Coyle, 18, will be giving his evidence from behind a screen.

Danny Shaw
BBC Home Affairs Correspondent

Now that the prosecution has finished its opening, it will now start to call witnesses.

Each witness gives evidence 'in chief' where they are asked questions by the Prosecution barrister.

Then, the barrister for each defendant (four in this case) has the opportunity to question the witness - 'cross-examination' - before further questions from the prosecution barrister.

The judge may also intervene to ask questions.

There may also be occasions when the prosecution barrister reads out statements from witnesses or experts that have been agreed with the defence and are not contested.

Image source, Family handout

Mr Aylett has explained to jurors what the term "murder" is in law as he brings his speech to a close.

He says: "The prosecution allege that, whichever of the defendants it was who stabbed Jodie Chesney in the back to a depth of up to 18cm, he must have done so intending to kill - even if Jodie had not been the original target.

"As for the others, it would suffice for each of them to have been a party to a plan intentionally to cause at least really serious bodily harm.

"As I indicated at the outset, the prosecution suggest that this case is not actually about identifying the stabber - although that will form an important part of your deliberations.

"Instead, the prosecution allege that all four defendants were part of a plan to cause at least really serious harm to someone in that park.

"If you are satisfied that a particular defendant was a party to that plan – in other words, he intended that someone should either be killed or else really seriously injured - and you are satisfied that that defendant participated in some way in the execution of that plan (whether by driving the others to the scene, or by encouraging the actual stabber to act as he did or by carrying out the stabbing itself), then he would be guilty of murder – whichever of them it was who actually stabbed Jodie Chesney."

Image source, PA Media

They jury has been shown some more CCTV, this time from the Retford Road area, near to the location where Jodie was stabbed.

Mr Aylett said this CCTV has been examined and enhanced by an expert in imagery analysis, Ashley Windsor.

Mr Windsor says the two figures who appear to be going into the park are "consistent" with them being Svenson Ong-a-Kwie and one of the teenage boys.

"In the event," Mr Aylett says, "It seems that Mr Windsor is right.

"On behalf of both Svenson Ong-a-Kwie and the boy, it is accepted that they were the two who went into the park."

Prosecutor Crispin Aylett QC is coming to the end of his opening speech and has recapped a few of his earlier points to the jury.

He says: "At the outset I made it clear that the prosecution allege that all four defendants were part of a joint plan to cause at least really serious bodily harm to someone - not necessarily Jodie - in that park.

"If the prosecution are right about that, then it matters not which of them actually stabbed Jodie nor who the second male in the park was.

"Nonetheless, I said that I would come back to such evidence as there is on these issues.

"The starting-point is to say that the prosecution accept that, in Retford Road, the first defendant was at all times behind the wheel of the Vauxhall Corsa."

On the day that Manuel Petrovic was arrested in Leicester, police officers went to his father’s house in Leicester, Mr Aylett has told jurors.

"There they seized a grey Puma tracksuit that appears to be what Petrovic had been wearing on the night of Friday 1 March."

Police also recovered a pair of "Adidas tracksuit trousers" from one of the teenage defendants.

The only other item of clothing seized was the woollen hat worn by the other teenage defendant - this was shown as an exhibit to the jury on Wednesday.