Baldie is quite right, I am not having a go at Andrew, only resighting my own personal experience when work was carried out by himself afew years back on my two remmies. When questioned on whether reproofing was necessary or advised he assured me that it was a pointless exercise especially on the heavy barrel, that resell without proof wouldn't be a legal problem unless it was to be done very soon after to a RFD. Make of it what you want but many gunshops have 2nd hand rifles on their selves either on s.o.r. or part exchanges which are threaded non standard without proof etc. I know this for a fact locally/ Essex but no names mentioned incase I've opened a can of worms unintentionally.