Hi Speedy,
I have friends who bitterly regret(ted) returning to the UK.
You will loose your winter fuel allowance (if you get it) as France with winter temps of -16 C is too warm !!
Currency fluctuations
Most official applications are now via the internet – make sure you have a reasonably up to date computer and where you settle has reasonable Internet speed.
Temperature here never gets below -5 afaik, and I've time and experience to insulate my new home seriously, and to install a big heat pump!
As to currency, I presume, as do most people here, that the value of the pound will sooner or later collapse. So I'm going to have to be earning a living of some sort in my eighties!
While the government believes that we can all do everything on the internet, they are mistaken. II arranged a meeting with my local tax people (they come to the village once a week) concerning a form which had been sent to me in the post. Not very many of its questions needed answering, but a few did, and there was no way I could answer them truthfully. E.g. home much did you pay for your house? Well I bought a single property, which was a house and some stables, above which there was the remains of an apartment. I paid for them as a single lot, and set about making hte apartment habitable, so I could move in there while work was done on the house. The revenue insisted that I now owned two properties, which I think was a bit unfair, but with only one life to live not worth trying to correct.
The lady from the Impôts said "Oh, don't worry about that, we don't care what you paid for it." The next question was "When will the work be finished". "Oh, just put next year. They'll send this form every six months, you can throw it away until yoou are ready". (Something I'd not felt able to do hitherto because the form proposed thousands of Euros of fine and possible imprisonment if I didn't get it back to them within 30 days).
I have a 9-month old MacBook Air, and my fibre internet connection runs at 70 Mb/s down, 23 Mb/s up today. Not as fast as I was promised, but adequate, given that it has only once gone off for a few hours.
I would pass on, however, that the internet here seems to me exceptionally full of parasites. Firms promising to tell you of the "ten best plasterers in your area", but actually only sending details of the luckless dupes who've been conned into paying up for the privilege of being listed, even if they a hundreds of km away. Very few firms seem to have their own sites, so the only hope is to try and find quangos whose advice is at least moderately trustworthy. I was given four names of 'experts' who could prepare an official "Étude thermique:" for me, as my heating firm had asked. One didn't answer the phone, had no 'répondeur', no email address. One never replied, another, a one-man band, came round and gave me a quote 50% greater than I'd already got from a big firm a bit further away, plus he attempted to persuade me of a bunch of things I knew to be incorrect. The fourth, who did respond, following a recommendation from a local architect, needed at least three prompts before he would reply to anything (and I discovered that his office had the same address as our man with the nonsense answers (who did at least visit!).
So while it is useful to have a good internet connection, it needs using carefully and appropriately. E.g. I've ordered an MT1 spigot for a drill chuck for the Britannia via Amazon.fr, and some cup-oilers from Ebay recently.
Best, T.