Family planning and sexual health clinics provide condoms free of change but availability can vary from one area to another. The following types of organisations may supply free condoms:

Family planning clinics (FPA)
Brook Centres
NHS sexual health (GUM) clinics
Young people's clinics if you are under 25

You can also buy condoms from:

Pharmacists
Drug-stores
Supermarkets
Record shops
Petrol stations
Vending machines