Problem sorted it was an O ring. I phoned a bloke who has mobile aircon unit to see if he would drain the system till I put it on he did better than that he did it and never charged me for it, mind it was just a 10mm bolt to take out old rubber ring off then new one on push the pipe in, bolt in and vaccum the system to remove any air recharge and that was it 30mins charged £45 and thats his price for a full service