I see that British Airways are to operate seasonal flights to Grenoble and Friedrichshafen from December 2014. Schedule below as noted on their worldwide Speedbird website.

[B]New direct services from London Gatwick to Grenoble and Friedrichshafen (Alps) from Winter 2014
British Airways is to launch new direct services from London Gatwick to Grenoble and Friedrichshafen (Alps) from winter 2014.

Starting on 20 December, the new flights will operate from London Gatwick on both Saturdays and Sundays, giving wintersports enthusiasts the chance to escape to some of the best resorts in Europe.

The services will run through the Winter until 19 April 2015. They will be operated by a mix of Airbus A319 / A320 aircraft with a 2-cabin configuration (Club Europe and Euro Traveller).

Fares start from £45-one way (hand baggage only) inclusive of all taxes and charges.

Flight details:

Flight Number Route Days of operation Timings
BA2754 LGW-GNB Sat 09:35 - 12:20
Sun 08:25 - 11.10
BA2755 GNB-LGW Sat 13:10 - 14:00
Sun 12:00 - 12:50

Flight Number Route Days of operation Timings
BA2756 LGW-FDH Sat 07:20 - 10:00
Sun 08:25 - 11:05
BA2757 FDH-LGW Sat 10:50 - 11:30
Sun 11:50 - 12:30