Thanks Mike. Second one was bought on Ebay - luckily the guy I bought it from lives on my route home, so I was able to check it over before bidding. There had been a glut of LX sales, so I got it for a reasonable price.
Alistair >Almost certainly misalignment, possibly a problem with the bumper that the mirror rests on. Should be a simple and (comparatively....) inexpensive fix. >Where did you get your second from?