I've now decided to go DCC, so they are no longer needed.
Hornby R905 Power Controller + R920 Circuit Controller – Boxed & Working
Hornby HM2000 Power Controller Boxed & R982 Power Pack Used
Hornby R965 Power Controller, Transformer And Power Clip
Vintage HORNBY R915 Power Controller
Hornby Original Power Controller Unit Type A3 00 gauge Bulb Not Working