France uses the SECAM system will we use the PAL system. PAL is superior to SECAM IMHO.
Oops Buckman, you are behind the times. PAL and SECAM (and NTSC for that matter) are for analogue services but France along with the rest of Europe has gone digital. Analogue TV in France was switched off on 30 Nov 2011.
However if you have a UK TV it will not work in France due to different standards in use.
In the UK:-
SD multiplexes (muxes) running DVB (sometimes called DVB-T1) use an encoding format called MPEG-2 - the same format but with less carriers as used by DAB.
HD muxes run DVB-T2 are encoded using H264.
In France:-
HD Pay-per-view terrestrial channels use H264
HD terrestrial channels run by TNT use DVB-T2 but encoded with MPEG4 where the rest of Europe uses MPEG2. It also uses Dolby Digital + (DD+) sound encoding.
To view HD channels the French need to buy a TV with the appropriate decoding capability or a TNT set-top box that will do it for them.
Almost all terrestrial TV in France is now HD but incompatible with UK HD. However past experience of TVs in Europe is that one of the set-up pages asks in which country the TV is being used which includes the UK and RoI. Ergo if you buy a TNT compatible TV in France it should work on UK broadcasts when you get home.
If you are of a technical bent and want to know more about digital TV in France have a look at
https://en.wikipedia.org/wiki/Television_in_France#DTT_transition
If you want to know more about DVB-T2 and what formats are used across Europe in general look at
https://en.wikipedia.org/wiki/DVB-T2