The best way to get to France from London. A one-way ticket costs 70 euros if you book early.
A very useful website with everything you need to know about each of the two main Paris Airports, Orly (ORY) and Charles de Gaulle-Roissy (CDG).
Another specialist in car rental.
The website of the French national train company. Buying online allows you to avoid the lines at the train station and find the best rates.