Hi Chas, i am trying to re-use the original key switch on a non original battery...i made a battery cover and bought a Maplins key switch to switch on 2 relays which in turn power the lighting and motor circuits, it works very well but it's as ugly as sin and it's not original, so i stripped the Sinclair switchand changed the lock tumblers for some NOS British Leyland locks in my spares bin.It now works as it should but how can i use it to switch on the power ???Is there an alternative you can supply ??