Why take 50 quid ?
I do not get that, if your getting guilt trips about taking it all and only take a "finders fee" your still taking, you don't get a pat on the back by the fairies for that you know, so it is clearly all or nothing.
A bottle of wine does not cost £850 in cold hard cash on a Wednesday morning and the Brucey Bonus of foreign currency now does it....
I think I would accept the cash getting taken if I dropped my wallet.