Lydia Greenway
Ex-England batter on BBC Test Match Special

Jenny Gunn has changed her game really well. She's developed a slower ball which would be her variation in the longer format, but it's her normal stock delivery here.

Captain Heather Knight rotates her medium-pacers as she turns back to the miserly Jenny Gunn, who only goes for two singles in five balls before the last delivery is whacked through mid-wicket - and into the England dug-out - for four by Du Preez. The required rate has leapt to over 20.

Here's that Ecclestone run-out...

Phil Long
TMS statistician

135 avoids the biggest score in women's T20s - but if they score 148 it'll be the highest aggregate score in a women's T20 international, and would mean we've seen two of the three biggest aggregate scores today.

After six different bowlers in nine overs, England turn back to Danielle Hazell's off-spin - she's reverse-swept for four by Van Niekerk, but a conventional sweep is well stopped by Ecclestone at short fine leg.

Lydia Greenway
Ex-England batter on BBC Test Match Special

The only thing they can do is try to target single English bowlers and get one over on them and knock their confidence, as it's extremely unlikely that they're going to get this score.

SA 54-3published at 9 overs

9 overs

Van Niekerk 20, Du Preez 12

England turn to Natalie Sciver as their sixth bowler as South Africa continue their pursuit of England's quite ludicrous total. Du Preez edges the medium-pacer past the keeper for four - while Van Niekerk gets down on one knee and lifts her side past 50 with a six into the crowd - with a man in a blue wig putting the catch down.

A four means it's 17 off the over. If they can do that another 11 times, they might get close...

Image source, Rex Features

Henry Moeran
BBC Test Match Special commentator

Has there ever been a better 48 hours for England men's and women's cricket, with a contribution from both?

Lydia Greenway adds: The 2005 Ashes was quite close together. We won our Ashes at Worcester and were waiting for the men's result from the Oval, as we'd get to go on the open-top bus ride!

Left-arm spinner Sophie Ecclestone, having redeemed herself for that dropped catch by running out Brits, is into the attack. She starts with a couple of dot balls before Du Preez helps herself to a four off her legs. But even though Van Niekerk carves a couple of fours, the required rate is up to 17.8.

Image source, Rex Features

Phil Long
TMS statistician

135 is the real target for South Africa, so they don't break the record for losing by the largest margin.

Mignon du Preez is the new batter - but it's a canny over from the experienced Gunn, which yields just two singles.

Jenny Gunn to bowl. Brits goes for a quick single, but Sophie Ecclestone's throw hits the stumps...

Here's those first two wickets:

After that Hazell breakthrough, England turn back to Brunt, and Van Niekerk whacks her over her head for four - but that's the only scoring stroke. A Herculean task for the Proteas skipper to lift her side from here, with the required rate spiralling past 16.

Sarah Clarke: Wow. South Africa women having a really bad day in the field.

Image source, Getty Images

Shdubsole not giving South Africa an inch - a maiden over to Brits means it's 16 dot balls from her first 18 deliveries (with one of those dots being a dropped catch!).

Brits is all at sea, having taken 11 overs to score one run - the Proteas are being strangled in the powerplay here.

Lydia Greenway
Ex-England batter on BBC Test Match Special

I've heard a rumour it's a sell-out here on Saturday.

Isabelle Westbury adds: And if you can't get a ticket, you can listen to us on TMS.

Dane van Niekerk in at four - her side need 229 from 96 balls.