so, got the shock of geoff (&more, couldn't help myself) and was heading up the road this mornin.
phoned proflex to see about getting it re gassed as slight detour on way up the road.
Long story short, popped in and chaps did it there and then. blethered away for far too long about other possible mods, think they would help you out with anything if you asked.
just thought I'd share the great service.