Postage stamps in the EU

[iantnm]

I have a postcard with a French postage stamp on it. Are all EU member states postage stamps valid in all other EU states, i.e, can I post it in the UK, for example?

[spudqueen]

No, only British stamps are valid in Britain. And even then there are restrictions, eg you can't use Isle of Man stamps in England, and any pre-decimal stamps are not valid.

[dzug]

Neither are French stamps valid in Germany, for example.