Thanks to everyone who answered my last post about Troyes.
I can now report back that it was as predicted - no bother about customs either in or out. The landing fee for an RV6 was 8 euro's
and self refueling 1.79 euro's per litre ( cheaper than Biggin).
We flew on to the beautiful town of Annecy and stayed 4 nights, only a landing fee of 12 euro's and free parking on the grass. Came back via St Yan then 2 nights at old town of Autun - no landing fee but fuel 2 euro's per litre. Only slightly dissapointing part of trip was the restaurant at Troyes was full with a football team
, so we had to persuade them to make us a sandwich. But did discover that the Novatel hotel is just five minutes walk and has a restaurant/bar/swimming pool.