Fourth and final stop on international media tour to promote fight
Events held in LA, Toronto, New York
Pair trade insults on stage at a sold-out Wembley Arena
Mayweather's age comes in for some verbals.
He then lays into Mayweather's entourage, who rounded on McGregor in New York.
Yesterday Mayweather instructed his team to "form voltron", prompting his entourage to surround McGregor and get in the Dubliner's face.
McGregor loves to wind Mayweather up about his height, apparently he wore heels yesterday?
"This is my first time in a boxing ring and in six weeks I run boxing" the birthday boy says.
Image source, Getty ImagesMayweather faces up to McGregor
"We are six weeks out from the biggest fight in sporting history and I am 29 today," says McGregor.
As McGregor starts on Mayweather, with the first, second, third, fourth...expletive of the night, the American seems to be taking a selfie.
Huge introduction for McGregor.
Let's see what the UFC fighter has to say.
The compere is getting roundly booed here. Now Dana White takes the mic to have a chat to the crowd.
The two are just shouting at each other in the ring before UFC president Dana White steps in and pulls the Irishman back.
They are then separated by a lectern and sit down at their respective tables.
McGregor has the microphone.
He is face to face with Mayweather.
As Mayweather enters the ring he is set upon by McGregor, who dances very much in his personal space.
Weird.
Image source, ReutersHe has smartened up for London.
A huge sparkling set of chains around 'Money' Mayweather's neck.
He stands at the entrance and very casually saunters to the stage. He shakes hands with the fans and is clearly making McGregor wait.
As the Irishman dances in the ring, he is stared down by Mayweather.
His entourage arrive and he moves towards McGregor.
These entrances have been a bit of a let down. Where are the fireworks?
Image source, Getty ImagesAs McGregor continues to interact with the crowd, Floyd Mayweather gets his official introduction.
Guessing a tracksuit and t-shirt combo for the American?
As already said, there is a boxing ring in Wembley Arena and McGregor enters it and starts shadow boxing.
This is classic McGregor, sharp blue three-piece suit, dramatic music.
He bows to the audience and strolls in like Liam Gallagher.
Image source, PAFirst onto the stage is Conor McGregor.
Mixture of boos and cheers for the Dubliner.
Here he comes...
Image source, Getty ImagesOh, worth mentioning that it is McGregor's birthday.
The Irishman is 29 today.
Have a feeling he might mention that at some stage.
Confrontations, shouting, goading, showers of dollar bills, a polar beat coat, a pinstripe suit covered in expletives, a Jay Z album, thousands of fans, plenty of controversy and LOTS of swearing.
That just about sums up the first three days of this media tour.
The consensus is Mayweather won LA, McGregor stormed back in Toronto, while the American edged New York.
So expect McGregor to come out all guns blazing tonight.
Image source, Getty Images
Image source, Getty ImagesIf you're new to this, let me recap.
UFC megastar Conor McGregor, who usually plys his trade in mixed martial arts, is fighting former five-weight world champion Floyd Mayweather.
The pair will meet over 12 rounds under boxing rules on 26 August in Las Vegas.
It's worth mentioning at this stage, that McGregor has never boxed as an amateur or professional, while Mayweather has won 49 from his 49 professional fights.
To promote the fight, they are holding four news conferences in four different cities, on four different days.
We have already been to LA, Toronto and New York and tonight we land in London.
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Get in touch with all your thoughts by tweeting #bbcboxing, I'd love to hear from you.
Big change from the previous three days, there is an actual boxing ring in the middle of Wembley Arena tonight.
I'm guessing those tables are to sit behind and not throw...where is Dereck Chisora when you need him?
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They should have been on stage at 19:00 BST, but tardiness has been a theme of this tour and they were 90 minutes late in New York last night.
Apparently we're not too far away from the main event, so fingers crossed.
Image source, Getty ImagesThese two have been busy this week, but one thing they haven't been is on time.
Who's ready for round four?