George Dunworth was employed by Boulton Paul in 1953 for Canberra modification work, this was due to the fact that Dicky Mancus could not fly them due to his thigh length was too long for the ejection seat. He had a runaway tailplane on Canberra WK185 in 1955, and was heavily involved in resolving this problem,which saved the Canberra in service.
