Alex Hartley
England spinner on BBC Test Match Special

What is she doing? England are stuck in a rut. You need to be running twos, get the run-rate to eights. They are playing eight or nine batters. There's no need to do that.

Van Niekerk is going to bowl her four overs straight through - tossing the ball from hand to hand between deliveries, an action seemingly beloved of leg-spinners at all levels of cricket.

More careful accumulation from England - Ismail is peaking at 77mph, she'll be enjoying bowling at the Waca, and even Sciver is getting a little tied down here - just three singles from the over, There's not been a boundary since the fifth ball of the 10th over.

It must be frustrating for the England batters looking on from the dugout - they still have the power of Tammy Beaumont, Lauren Winfield and Katherine Brunt to come.

If you're just joining us, this was the Amy Jones highlights reel...

Nicky Shaw
Ex-England all-rounder on BBC Test Match Special

120 is the minimum England need to be competitive.

Van Niekerk, with 1-8 from her first two overs, is quickly through her third - and is yet to concede a boundary. Four singles and a well-run two - this partnership is worth 23.

And this is how Danni Wyatt fell off Khaka's first ball.

Nicky Shaw
Ex-England all-rounder on BBC Test Match Special

Wilson looks like she is batting with a stick of rhubarb, but she has to stay with Nat.

Wilson's not timing it greatly here, a cross-batted dab to mid-off allows her another single. Four from the over. I wonder what total they'd be looking at - anything less than 120 would be well below par.

Dan: Alex Hartley saying she wouldn’t recognise Brian May as he would look just like an old man is the highlight of the T20 World Cup already.

The Proteas turn back to the pace of Shabnim Ismail, Sciver steers a single to third man but Wilson is beaten for pace as she attempts a cut shot. A single takes her to seven from 13 balls - the more assured Sciver moves up to 17 from 18.

Nicky Shaw
Ex-England all-rounder on BBC Test Match Special

It is hard when you dive full length, you have to thinking about putting your bat the right way and getting in.

Sciver pushes a quick single to mid-wicket, and is grateful for a fumble by the fielder which prevents a possible run-out chance. Wilson nudges a two to fine leg, needing a full-length dive to make her ground. A quick check upstairs... and she's home.

Van Niekerk to continue, she will feel vindicated in her decision to field first. She restricts England to three singles from the first half of the over. Can England move up a gear?

Nicky Shaw
Ex-England all-rounder on BBC Test Match Special

Fran Wilson is struggling, but Sciver is timing the ball really well.

Wilson finally gets off strike and Sciver, who's not faced many balls in the last couple of overs, smashes a ropey full toss to cow corner for four.

Some very energetic cheering and flag-waving from a posse of England fans at the Waca as we reach the halfway point of the innings.

Here's how it ended for Amy Jones:

Nicky Shaw
Ex-England all-rounder on BBC Test Match Special

Sciver is having a word with Wilson, telling her to calm down. If they lose another wicket now, they are in trouble.

Some good flight from Mlaba, Fran Wilson is normally a good nudger and deflector of spin, but she's deceived by one and is lucky not to be either caught, or stumped, or both.