Hello. I looked for a guide service and couldn't find one in the Sarlat area so I hope someone else logs on and answers you here.
In the meantime, have you considered renting a car and driving yourself? We do that all the time and both the Tours area and the Sarlat area have very good roads and very easy driving. You don't need to speak French to drive, just a GPS or a good map. We use the Michelin "France Tourist and Motoring Atlas" and it works very well.
Just a thought.
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