Auction house Bonhams in Knightsbridge, London, will be holding its first ever Open House on Tuesday 3 May, from 9:30am to 4pm. Over 20 Bonhams' specialists will provide free saleroom valuations on ceramics, silver, jewellery, paintings, furniture, works of art, books, clocks, watches, coins, medals, musical instruments, arms, sporting guns, collectables and memorabilia. My guess is that the queues will be long, as in BBC One's Antiques Roadshow. A first-come-first-served queuing system will be in operation with tickets issued for the various categories of objects to be valued. I would arrive early. Click the title link for more information. And don't forget to let me know if that grubby old painting in the loft turns out to be a Stubbs.