Hi all just got the gun back from a local gunsmith called Richard Large.
The nylon part of the valve was jammed and a couple of the seals were on their way out too. He has returned it to me completely serviced and up to the maximum just sub 12FT Lbs and I have to say it is what I expected it to be.
He tested it and it now gives 75 shots per fill at 190 bar, I can't recommend him enough as he is one of the few gunsmiths to also work on PCP and air rifles.
Cost was £60 all in, and I now have confidence in hitting those rabbits, the cometa may stay for a friend to use?
Thanks for