You can be fined up to £150 for dropping litter in the UK. 

(Previously fines had been set by councils, varying between £50 and £80, however now under guidelines drawn up by the Department for Communities and Local Government, litter bugs could face an on the spot fine of £100, and if they do not pay up within a designated period it could increase to £150.
Fear of being fined shouldn’t stop people from littering.  A wish to live in nice surroundings should be enough.)