+1 to the first reply. Any new UK bought TV should happily receive French TNT broadcasts, which are now only in HD (i.e. it must be a set with an inbuilt HD tuner).
Have you set it up in the UK before bringing it over here? If so you will need to rescan to get the TNT channels &, obviously the UK ones will disappear. This assumes you have a working & correctly aligned aerial in/on your property.
If you wish to receive UK TV the usual route is to get a Freesat or Sky (yuck!) receiver hooked up to suitably aligned dish.