On 1st July 1928, the R.A.F. lost one of it's finest aerobatic pilots in a freak accident when Avro 504N (H2534) of the RAF Practice Camp at Sutton Bridge, dived into the ground not far from RAF Henlow, killing Flight Lieutenant Harold Charles Calvey of No.23 Squadron, Kenley and Flight Sergeant William Charles Hollier, a carpenter/rigger.
