I go to a lot of auctions,I will keep watch in the South East.
It is worth talking to your Insurance Society and it is possible to insure your concertina(or musical instrument)against theft when you take it out of the house.I know how I would feel if one of mine was stolen, but at least I could afford to replace it with the Insurance money.A correct valuation is required(an Auction House will do this) with photos or video.In this case it is too late, but may assist many of you who have not thought of it.
On another site we discussed the possibility of micro chipping instruments but it would need a large number of participants to make it viable.
I am very grateful to all of you who have set up this theft network and I just hope I never have to call on its services.
Al