Hi Phil, Will attempt to post a couple of phots once my technical director (aka wife) can photograph the switch. Looking at your picture, that is most definitely an original - had a thought and actually it is identical to the window switches in my Sprint. In which case Paul Matty or Sue Miller might have them.
The switches from Richard are different. The front can be described as having three seperate facets - thin flat horizontal mid section with subtle convex curve to the top and concave to the bottom. They also have a depiction of a half open window on them. That said, although not as original, they do not look out of place.
Not sure whether original items are still available. Did manage to source/buy a pair several years ago still in their Lotus blister packs but not cheap!!
By the way, I think that Lotus originally sourced them from a washing machine company which is why they have "230v" embossed on the reverse. (Local recycling centre might be able to help!)
Cheers,
Martin