Recommended Airlines from the UK
British Airways fly from London Gatwick to Bordeaux
EasyJet fly from Luton, Gatwick and Bristol to Bordeaux
Ryanair fly from Stansted to Bordeaux and La Rochelle
Flybe Bristol and Southampton to Bordeaux and from Manchester to La Rochelle
Jet2 fly from Leeds Bradford to La Rochelle
By Ferry & Car
Recommended channel crossings from the UK
P & O Ferries and several others sail from Dover to Calais, Portsmouth to Le Havre etc.
Brittany Ferries sail from Portsmouth to Caen and St Malo, Plymouth to Roscoff, Poole to Cherbourg.
Our personal recommendation is the crossing to St Malo with only 4½ hours driving time from port to house.
There are plenty of other choices.