A cyclist passes the facade of the now-derelict Walthamstow Stadium, owned by property developers L&Q, in Walthamstow, east London May 31, 2012. Blaming track closures in Reading, Walthamstow, Hull, Portsmouth, Coventry and Oxford, the Greyhound Board of Great Britain say that the number of professional trainers has fallen by 129 in the last five years, from 510 in 2008 to 381 today. Picture taken May 31, 2012. REUTERS/Chris Helgren