Hello Paul
No idea about running a gite business although there are many many discussions on here and I suggest you read those. For example, there is lots of information in this thread Living in France part time and Managing a Gite or two = No Brexit Responses Please!
Apart from running a gite business you should also think about the following:
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You need to speak French, well at least one of you does. I can’t stress enough how important this will be if you want to communicate in basic places like shops, Doctors, with neighbours. YOU REALLY NEED TO LEARN FRENCH AS A PRIORITY
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France has winter just like the UK. Depending on where you chose winters can be long, cold and dark. What will you do on cold dark evenings in February? There will be no tourists then.
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Never underestimate the nightmare of paperwork in France. Everything from sorting out healthcare, registering a car, buying property, paying taxes to opening a bank account. You will be snowed under with paperwork and it will all be in French. You will need to understand French to deal with all this or have sufficient money to pay for someone to help you with it.
That’s just 3 things to consider and there are many more. Having said all this if you like wine, cheese, sunshine, a slower pace and village life then France is a wonderful place.