How long has the basket been planted with these pansies, and is it in full sun all day?

Pansies do get stressed in the heat. Has it been hot lately?

Yes it has but I keep them topped up with water theu are in sun half the day of the morning. Not sure how long been pla ted as I boughtthem already planted in baskets and flowered x

I fear they have exhausted themselves Anneth. You could try cutting them back quite hard...so there's only a couple of inches of growth left and they might come back beautifully for you, but tbh, looking at them I think I'd tip them out and get some new ones. If they do come back again, it will take a while.

I agree with the consensus here. Pansies are cool/cold weather plants. They go dormant about now, but will come back in the Fall. They simply run out of gas. I would give your baskets a makeover. Install some summer blooming annuals

Ahhhh gutted. Thank you. They have a gel layer in them should I scrap that too?

Usually better if you do, but not always necessary. If it has turned brown, I would discard it: it has absorbed too many toxins.