From the UK by ferry
There are several very convenient ferry lines, closest one is to Cherbourg (40min drive), then Caen (1 hour drive) or Le Havre (2 hours drive)
Closest airports:
Caen (not to be be mistaken with Cannes!) 1h away – direct flights from the south of France
Dinard 1h 30min drive with direct flights to London
Rennes 2 hours drive
Beauvais 3 hours drive – low cost international flights
Paris Orly or CDG – 3h and 30min drive – all international flights