French Geneologist needed to research my Breton ancestors

My English ancestor go back to the 1700s and features people mostly from the London area.

However I have just discovered that four of my direct ancestors emigrated from Brittany to London in the 1650’s

I have their names, dates of birth / marriage etc and their village name. However a visit to the village (and graveyard) gave no further clues or contacts to caryy out further research.

Does anyone know of any professional Genealogists specialised in this area?