I hardly watch any telly so, unsurprisingly, I've not seen the programme. However Wikipedia can (hopefully) explain the rules for you:
https://en.wikipedia.org/wiki/Cash_Trapped
I really enjoyed tonight's episode. They all seem to be having so much fun and no one seems to get narky about being frozen out or cash trapped. Rhiannan/Beyonce was brilliant and she has such a sense of humour. I am getting to like it more and more.
I turn over as soon at starts and watch reruns of The Chase. Far too much nattering going on that is just not interesting. Far too much explaining what is going on by Bradley too.