If you follow the Mulivex thread at the Lotus Forum
Multivex Mirror review - LotusTalk - The Lotus Cars Community
there are those who love and swear by it and a few that won't even try it. Did not see any trying and removing even though it's a non destructive mod. One said seeing the edge of the glass became no big deal after a while and some others painted or put plastic around the mirror. Some decent solutions actually. (with pictures)
I have only been through the first three pages where there was talk about the UK mirrors but no one had bought them yet (by page 3). There are dozens of aftermarket sellers for Lotus many in the UK. Check this page:
I want to try this first. Am am interested in CF same-shape mirrors.