A question on tv licence

friends of ours have not been back to thier french house for a year and a half and they dont know if they are liable or not to tv licence? any tips? they may want to eventually move over there so may then want to have tv. any tips appreciated.

it's detailled on the taxe d'habitation form, it's automatic unless you tick to say you don't have a TV and yes they should be paying it if they've got a TV, even if they don't go to the house all year but there's a TV in it that's never switched on, technically they must pay ;-)