Nothing, quite literally NOTHING. I realised on my way in that I've left all my cards and cash on the side by the phone. I was just relieved I didn't need petrol.
I still didn't count it... but I've spent £4 on a sandwich (sliced egg, ham and coleslaw, with salt and pepper, on brown bloomer), a bottle of citrus diet coke and some Walkers Builders Breakfast crisps - which are pretty decent.
In short, I don't know, but somewhere in the £78-85 range, I would guess.