Mains plug also needs changing to a safety one too.
Vintage HORNBY R915 Power Controller
Vintage HORNBY R915 Power Controller tested
Vintage Hornby R915 Power Controller Tested & Working
Trains, Train motor, Vintage, Hornby R8012 HM2000 Analogue Dual DC Controller
HORNBY #R915 `POWER CONTROLLER` (POWERED UP BUT NOT TRACK TESTED)