Can caernarfon pubwatch scheme try,convict and exclude anyone without trial?

I have been banned from all pubs in Caernarfon for no reason.I received a letter through th post telling me so and giving no reason,there was not even an address that I can reply to.Even a common criminal has a right to trial and to offer a defence.This kangaroo court is conducted in complete secracy and there is no appeal allowed.I beleive that this is in breach of the European human rights law.Can you advise please?...Howard Middleton