I didn't find on this forum or on the Swiss and municipal government Web sites the answer to the procedure and list of documents required for a Swiss citizen bringing an EU spouse to live in Switzerland. I rang the Montreux population office and got the following answer in respect of retired persons (additional information might be needed if the spouse is planning to work):

I need to bring the usual registration forms (downloadable from http://www.montreuxofpop.ch/ ), my Swiss ID card or passport, her British passport, 4 photos of her, our marriage certificate (probably redundant since I have to bring our livre de famille also; I ordered it from my commune of origin in Aargau) and a bunch of francs. Also proof of solvency. I told them since I could afford to by a flat in Montreux I must be solvent but they want my pension statement too. I'd give them my AVS statement but I only get 211 francs a month from AVS: chump change.

(I remember many years ago when I was living in Vessy and my (Swiss) mother came to visit from New York. I asked the local authorities what she'd have to do if she wanted to stay. They told me that she'd need to ask permission since she was from another canton. I asked if permission was ever refused and they said no. Since then (1992) Switzerland has abolished that formality, and that despite the fact it never ratified Protocol 4 to the European Convention on Human Rights and Fundamental Freedoms, CETS No. 46 http://conventions.coe.int/Treaty/Co...03/2010&CL=ENG ) That Protocol has not been ratified by the UK either, and that because of laws in force allowing the UK Government to restrain persons it deems terrorists from traveling or moving, typically between the mainland and Northern Ireland (Exclusion orders under the Prevention of Terrorism Acts).)