Pc Blakelock and his colleague Pc Richard Coombes were attacked during the Broadwater Farm riots in Tottenham in 1985.

BBC: Murdered Pc's officer son says pain 'will stay forever'

Sgt Daniel Pitcher and Pc David Upjohn were sent to the scene of a fire at Marlie Farm, East Sussex, in December 2006.

BBC: Marlie Farm fireworks explosion police get awards