Is there a West Ham United-related fact, figure or story you are desperate to discover?
Perhaps there is a weird or wonderful Hammers question that you just have to find out the answer to? Or maybe you simply want to settle an argument with a fellow fan?
If so, it is more than likely that club historian John Helliar knows the answer. If not, John's unrivalled collection of programmes, newspaper clippings, photographs and other memorabilia is almost certain to contain it.
'Dear John' will be just one of a variety of exciting new features that will appear in West Ham United's official matchday programme in 2009/10.
Fans can test John's knowledge of the club by sending their questions to [email protected]