Used to have one of those in the first Land Rover Dave - hated it, didn't work correctly half the time, neither did its replacement!
More room in the footwell of a Landie too!

Problem now sorted - switch not at fault. I (possibly the mechanic?) reconnected a wire to the wrong switch connector. Posted the results on MT, where most traffic on this issue passed. Though, if I did it, it must have been done before the last MoT - so how did it pass the test?
Anyway, all sorted, the extra wire will go to a spare switch, ready for an old Lucas rear fog lamp to be fitted.
Cheers,