We haven't spent the whole of this week's £21 yet, thank goodness!
So far, I've spent:
Clementines (big bowlful off the market) £1.00
Cheese (2 for £6 offer) £6.00
Peperami for pizzas £2.35
Total so far £13.87
That leaves £7.13 in the pot, which will go into the sealed pot if it doesn't get spent. I do think more will be spent at the weekend on vegetables, though.