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Heather Knight averages 64 in her last 10 innings in Test cricket, compared to a career average of 45.

England take four from the Sune Luus over and there seems to be a bit more intent from them now.

That is shown as Heather Knight defends into the off side and calls for a quick single.

The England captain is not the quickest between the wickets and certainly takes a bit of time to get up to full steam but she got home safely enough this time.

Ffion Wynne
BBC Sport cricket writer on TMS

We've seen two collapses in this match. One from England and one from South Africa, but it's quite hard to know why that is. Maybe it's a bit of weariness and lack of concentration.

Rufus Bullough
CricViz analyst

England will be hoping to be back in the field come the evening session where it has been hardest to bat so far through the Test, judging by the average runs scored per wicket:

Morning session average: 51.50

Afternoon session: 60.40

Evening session: 14.84

Plenty of love for Maia Bouchier's hundred at Worcester so far! And why not?

Back in Bloemfontein, Heather Knight gets slightly lucky as she top-edges a sweep and the ball loops up and over wicketkeeper Sinalo Jafta.

It is pulled in before the boundary and Knight has to settle for two. It could have been far worse for the England skipper.

Heather Knight has been joined in the middle by Sophie Ecclestone and the pair exchange singles in the Sune Luus over.

England will hope Ecclestone can do a job and stick with her captain for a while here while they try to get up to a lead they're comfortable with.

Melissa Story
Test Match Special commentator

The ball just dipped on Tumi Sekhukhune and she did well to get her fingers under it. Charlie Dean was playing around her front pad. There's a pattern in this match where the middle and lower orders have fallen away.

Lydia Greenway
Former England batter on BBC Test Match Special

A tame dismissal for Charlie Dean. She's just playing in front of her body. It's a great catch in the end from Tumi Sekhukhune. Nonkululeko Mlaba has such joy whether it's bowling or in the field.

England will still feel they are in a good position but there will be a part of them where they don't want to get bowled out here.

England's lead moves beyond 300 as Nonkululeko Mlaba fires one down leg and it beats everyone and everything, running away for four byes.

Rufus Bullough
CricViz analyst

Pace has dominated proceedings in this Test so far (16 wkts at 27), but the balance of power seems to be beginning to shift towards the spinners who have struggled in the Test so far (7 wkts at 54). Mlaba has now become the leading wicket-taker in this game with 6-138 across the two innings.

South Africa continue to try and squeeze England with Sune Luus' latest costing only a Charlie Dean single.

As much as they might want to get a move on at some stage this afternoon, England don't really need to rush things at the moment.

Lydia Greenway
Former England batter on BBC Test Match Special

Charlie Dean is competent enough to bat at number seven and has a really good mental approach to batting.

Wicket maiden for Nonkululeko Mlaba.

But there is one bye from it as the ball stays very, very low outside off. New batter Charlie Dean tries to cut it - that's how short it was - but the ball barely got off the ground.

Not bad signs at all for England given they'll be bowling last on this pitch and already have a pretty healthy lead.

Lydia Greenway
Former England batter on BBC Test Match Special

The field was ideally set for Amy Jones. All that she was looking to do was pump it down the ground for a single but has got a leading edge. Nicely done by South Africa and it shows they have been a lot more switched on with their field settings.

Whether England wanted to come out and increase the run-rate or not, the discipline of the South Africa spinners has meant that has not been possible thus far.

Another tidy over from Nonkululeko Mlaba and nearly her first wicket of the innings.

It would have been some catch had it stuck, though.