Sounds like you may have a property not dissimilar to our old Breton home but more than a tad further north!
First priority would be to insulate and draughtproof to the max and then some.
Ground based PV is great and now pretty cheap. Scaffolding is a great big boys mecano, non concrete ground fixings have come on leaps and bounds.
We loved our wind turbine, Ours was 2.5kW just about the max for handling two handed for maintenance. Spend a little extra on getting a tower that you can raise and lower easily. We had the least expensive option of a guyed option, helped by Biff's advice on the correct geometary(vital) but an easy to raise and lower tower would have been great. Hindsight is wonderful.
PV is install and forget, a turbine will need maintenance.
What fun you will have, good luck with the planning. Don't forget we love pictures and regular updates.
