There are regular flights to and from Poitiers Biard Airport with Ryanair from London Stansted which will get you to the historic city of Poitiers, a 40 minute drive from Fleur au Soleil. Car hire is also available at this airport. Ryanair also fly into Limoges 1hr15 minutes from Fleur au Soleil and La Rochelle, 2hrs.
Brittany Ferries has an overnight ferry to Caen from Portsmouth which is a 4.5hr drive from La Charente, or there are shorter crossings from Calais with P&O Ferries or Eurotunnel which is a 7.5 hr drive to the region.
There are regular trains to Poitiers from nearby Ruffec from where you can join TGV services to Paris and connecting Eurostar trains. The total journey time from Ruffec to London is approximately 7hrs.