Image source, Getty Images

A booming drive from Emma Lamb sprints to the cover boundary for four and she overtakes Tammy Beaumont, whose scoring has just stalled slightly.

Time for a drink and they'll be desperate for one. In case I hadn't mentioned it's really hot here today.

A tidy start from spinner Nonkululeko Mlaba as she concedes just three singles.

The cloud cover just breaks over again and gives the players a bit of a breather.

Henry Moeran
BBC Test Match Special

That's an aggressive shot from Emma Lamb. I think she fancies a piece of de Klerk's bowling.

Nadine de Klerk, the feisty and competitive all-rounder, comes on to bowl ... and is greeted by Emma Lamb plonking one over mid-off for four!

Many of the South Africans are rocking the floppy hats. I'm just not a hat person. Don't think I'd pull one of those off, as cool as they are.

South Africa need a burst of magic from someone.

The usual suspects of Kapp and Ismail haven't provided it yet.

Lauren Winfield-Hill
England batter on BBC Test Match Special

The body language of the South Africans looks a little bit mundane. No one is really rallying around each other. That togetherness you can present as a fielding unit is massive. You should be able to show a real unity in the field.

Henry Moeran
BBC Test Match Special

That flew off the face of the bat!

Full from Ismail and driven firmly for four through cover by Emma Lamb. Glorious!

South Africa look flat. It's only been 12 overs. These are pretty worrying signs for them.

Henry Moeran
BBC Test Match Special

Never mind a beret, what's to say you couldn't wear a sombrero out there?!

Or perhaps a bandana?!

As much as watching England bat is obviously fun, it's also very entertaining to watch the crowd try and come up with ways to keep cool.

Some are drowning themselves in factor 50, there are several different styles of hat, handheld fans, you name it.

I don't even want to think about how burnt I'd be if I was sat outside today.

Henry Moeran
BBC Test Match Special

Members of the French women's cricket team are here today. They have come from Nantes to Bristol! How brilliant! They are all wearing stripy tops and berets!

Lauren Winfield-Hill
England batter on BBC Test Match Special

The girls mustn't miss out on those loose deliveries. If they build a phase of play where they can attack the stumps and execute a plan, they will score highly. They must put those deliveries away.

More width from Ismail this time and with her pace it races off Emma Lamb's bat for four.

Beaumont follows it up with three to mid-wicket.

There's just been too many bad balls in amongst the good ones for South Africa and England have put them away with ease.

Lauren Winfield-Hill
England batter on BBC Test Match Special

Marizanne Kapp has been so consistent for South Africa who have turned to her in so many scenarios. It just feels like she can't find her rhythm and hasn't settled into anything today. Perhaps she's trying to force a wicket too early?

That is an excellent opening powerplay for England. Batting looks very comfortable.

South Africa have got to tighten up now or they'll be conceding around 400!

Melissa Story
BBC Test Match Special

That is a fantastic shot by Lamb. An overpitched delivery from Kapp and Lamb gets her hands through that. She never misses out on those square drives.

Oh, lovely. Shot of the day from Emma Lamb, driving square of the wicket for four. She has really quick hands and pounces on anything loose.

Looks like this has been an excellent toss for Heather Knight to win. The pitch is a belter.

A rare misfield by Laura Wolvaardt at cover allows England to run two and that brings up England's 50.

That's come in very good time for this pair.

Lauren Winfield-Hill
England batter on BBC Test Match Special

Image source, Getty Images

You've got to strike Beaumont early or she will find her form. Tammy will have hated the fact she missed out on the last match. But she will be pleased with the intent she is showing at the moment. She has a good strike-rate and a positive start and that will give her a lot of confidence today.

A much-improved second over from Khaka concedes just two.

There are quite a few people watching from the balconies overlooking the ground, soaking in the Bristol warmth. What a life.