Lowell made the comment initially, but it bears repeating: If you're not familiar with British guns and the British gun trade, reblacking the barrels, honing the bores if necessary (so long as they stay within proof standards), redoing the wood--that's the way they do it. The Brits, for better or worse depending on how you look at it, do not have the same "original condition" hangup that afflicts many American collectors. Doesn't make any difference if it's a Purdey or a gamekeeper's Brummie BLNE. If something needed doing, the owner didn't worry about "original condition". What he worried about was whether his gun was properly maintained.
