Auctions often reflect what is not selling more than what is selling. Dealers who have guns that they can sell easily for top dollar or pound in this case are not going to send them to auction. In the recent past that was hammer guns, ten bores, damascus doubles and low end doubles plus beaters and parts guns.
Notice how the quality of guns is up over the last few years to more mid range to top range guns. Also many more modern O/U are hitting the auctions. So I suspect a resurgence in interest in damacus barrels. Remember they never had the stigma attached to them over there that we have had over here. No terse warning on every box of ammo for 75 years telling every shooter that damascus barrels may be unsafe. Taste change and then go back to what was quality before the change.