Bit of a long shot but at suggestion of Martin Sharp (no relation) on Facebook I wondered if anyone had a R/H switch gear set for a 1986 SPII (also used on T5 and Millie’s I think) I could buy?
Link to F/B showing the unit is Redirecting...
Tony Sharp
Gutsibits say they have second hand switches click here
I have a couple of these but somebody; not me; has chopped off the subloom but there is an inch or so of the wires remaining, so if you are desparate and good with a soldering iron i will send them to you!
Have checked but unfortunately none of these!
Wow Nik, thats very kind of you and it may yet come to that! (not me mind fat fingers and to little patience!)
are you on facebook so I could DM you my address?
You could DM him here. Click on Nick’s ‘icon’ in the post above, then envelope button… viola!
If you have to extend the wires, don’t put all the joins at the same place, or you will end up with a big fat lump in the outer sleeving (don’t ask me how I know 
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Stagger each of the joins along the length of the wire.