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Which enigmatic detective wore a silly hat, played the violin and displayed a distinctive sartorial style that will be the inspiration for the outfits of hundreds of people for this Guinness World Record attempt? Elementary, my dear Watson. If you're a big fan of Mr Holmes (or just really enjoy being part of a mass fancy-dress event) you'd best buy a ticket to this gathering, which will be raising money for the restoration of Sir Arthur Conan Doyle's study. To take part you will need a deerstalker hat, a cloak, a pipe and a magnifying glass; should they prove as elusive as Moriarty, for an extra tenner the organisers can provide you with everything but the. A raffle will also take place on the day, with prizes donated by The National Literary Trust and BBC 'Sherlock', among others. Book in advance.