Thankyou All,
Trusty paul at Rovercare fixed it yest' ,used the hose I had from my regulator change(which I didn't bother putting on),the hose manufacturer is different,so I'm hoping this one is more suitable for the Bio,can't complain as I haven't put a spanner on the old girl in two years,bar services.
Thanks again for the help and advice
Cheers Gregg