The Provincial Booksellers Fairs Association (PBFA) was founded in 1974, with just 20 members, in order to provide provincial bookdealers with a shop window in London by holding a regular book fair. More than a quarter of a century on there are about 550 members and the PBFA organises around 100 book fairs a year. The calendar can be found here. On the 27th June the National Motorcycle Museum at Birmingham hosts one such fair. Details here. May be an opportunity to find that longed-for book.