50p for the meter
When poor people, or 'scratchers' (see separate entry) have trouble paying their exorbitant electricity, or 'leccy,' bills the capitalist thieves at the leccy companies give them electricity meters that have to be fed fifty pence pieces at the rate of several an hour, thus avoiding bills altogether and giving rise to the much uttered phrase 'Anyone got a 50p for the meter?'
It also makes for hilarity if the 50p runs out and you are plunged into darkness, say when carrying a scalding hot vat of oil through a room full of randomly discarded roller skates.