Both routes were AEC Routemaster operated, however Route 225 was created purely as a means of converting the eastern end of what was route 25 to one man operation which took place under the next programme of changes on 23 April 1983 using Leyland Titans from Seven Kings and West Ham garages.
Both routes were operated by AEC Routemasters, however Route 225 was established solely to transform the eastern end of what was route 25 into a single-operator service that occurred under the subsequent program of changes on April 23, 1983, using Leyland Titans from Seven Kings and West Ham garages.