Can anybody tell me where I can get a new drivers door seal for a vauxhall astra (5 door) MK5, supplied and fitted ( as cheap as poss)

The only places you would get a door seal is either scrap yard or the vauxhall dealership mate. Usually they just push into place around the door apening.

Yeah just go to the local scrappys on Cleveland Street. Probably pay around a fiver or around £50 upwards from a dealer.
It will take 5 minutes to fit and even easier with a small rubber mallet

cheers folks will check the scrappys out on my next rest day