Thanks phillb for the extra detail. That other thread made interesting reading. I didn't see it earlier - I need to work on my searching skills.
I think of the bits and pieces I have, very few are right for my car, so not too worried about originality, just wanted to get things right where it's easy. It doesn't help that some of the overseas suppliers seem to have a policy of always sending the wrong items, based on the (generally correct) assumption that I can't be bothered returning them. I was thinking if the switches are in the wrong order I'd be able to flip the panel over, but as you point out it makes no difference if I want the switches to be the right way up.
There seem to be a few variations, anyway. Also wasn't aware many cars didn't have the heater. Maybe I wouldn't have spent so much time trying to jam a Clubman heater in otherwise - that thing seems to take up as much room as an extra passenger. As for switches, I'll keep the original wipers on the left layout, especially since that's the way my holes are cut. Actually I'll be using an MG switch for the wipers since I have a two speed motor from a Clubman. The champions in this forum have already worked it all out some time ago.

Detail here:
http://www.ausmini.com/forums/viewtopic.php?t=49056
The washer pump I'll set into the right side wheel arch since I reckon that'll look better. If it turns out to be hard to use I'll fit an extra tentacle behind my right shoulder.
One other interesting point was made in the other post you mentioned, phillb. It seems that girlfriends, partners, etc. will invariably assist the driver in switching off the wipers when they feel the drizzle has reduced to a level that doesn't warrant wipage. This is unavoidable. When I used to get around in an ancient Audi the fact that the wipers were controlled by the right hand column stalk never worried my girlfriend at the time. I reason keeping the switch as close as possible to the passenger will make this phenomenon less annoying.