If you are the owner or the person responsible for a place to which the public has access you are obliged to keep the place litter free, regardless of how the litter got there. This applies to any public place which may include the precincts of a shopping centre, a school campus, a public park, a train or bus station.

Posters and Signs
The law forbids the putting up of posters/signs on poles or on other structures in public places unless you have the written permission of the owner of the pole or other structure in advance of putting up the posters/signs.

Advertising Flyers
The placing of advertising leaflets on car windscreens is prohibited and if you are proposing to distribute advertising leaflets in the street, you should first check with the local authority to see if they have introduced any local litter restrictions, which they are entitled to do.