Dioralite, the stuff you drink if you have had the squits. Pint of that before bed.
2 paracetamol, fizzy cola and a fry up in the morning.
If its a hangover that is set in for the afternoon, lots of tea, toast with jam. I find that a Hot and Spicy Pizza helps.
Thing is, worryingly, my hangovers are not as bad as they used to be, maybe its drinking proper beer that helps or my body is getting used to it.