Speaking of rude, what is this all about Bonsoir? "I think MrsS and I are a bit more worldly and better travelled than Rhubarb..."
Bit presumptious aren't we? Do you know me personally? Have you any idea of my experiences or circumstances?
The one thing I did not like about France were most of the ex-pats who claimed bits of France for their own, never socialised with French people, insisted on buying English food and tried to have their own little piece of England in France. Would you believe there are even English owned pubs where the French are not welcome?
But the French take all this in their stride. They are a very welcoming nation for the most part (I won't say you'll never come across any predjudice) and very happy to help.
The only thing that concerns me is that you say you aren't very sociable. The French are. Most villages have street parties once a year and they know all their neighbours. The sense of community is quite strong in the rural countryside (the cities are more anonymous) and they will invite you round for tea because that's just their way. Expect around 10 courses and to eat at around 10pm.
I don't think you are taking a risk if you have a house here. We sold ours and went to France before we had jobs, a home, anything with 2 children in tow, one of them was just a baby. We lived in a caravan for 3.5 months. If you are determined enough you can make it work for you. You'll have a house back here and one in France so there's no risk in my eyes.
House prices aren't that much different to here but don't forget that you may end up paying much more in legal fees, surcharges etc. There is always something that needs paying. However the pound is quite strong against the euro at the minute. You probably would get more for your money over there (depending on where in the UK you live) but be warned that cheap houses, just like cheap houses here, will be cheap for a reason. Do your research before you buy.
It would be sensible to rent for a while first anyway rather than plunge straight into buying. Then you can get a feel for the place, meet the neighbours and figure out if it can work for you. Nothing ventured nothing gained.
Whilst you are in a position to have an adventure I say do it. Life is definitely too short and what's the point in living if you can't take a few risks?