been on both sides of this situation, once in luton where the dealer messed up the side pot, the dealer said it was correct when i questioned, we moved on he kept dealing the next hand, kept thinkin about it and it just didnt add up ( i ended up with half of what i should have had), told the dealer and he sorted it out 2 hands after it had happened. Everyone happy.
And recently at walsall was playing with my chips that were in the big blind in front of me, picked them up when i went to look at my cards, folded to the action in front of me, mucked my cards and held on to the 2k. it was only after the next hand had been dealt that i realised i still had them in my hand and coughed up to my mistake (no one else noticed) and handed them over to the winner of the previous pot.
Again everyone happy, no need for rulings etc. Best way IMO.
OH that's just soo wrong lol