I believe when your drone is registered in your country of residence, in this case UK, you no longer need to register it in France. You can then just fly there under the current French rules.
Difficult transport: Due to a broken bridge in Säynätsalo in Jyväskylä, heavy traffic must travel by ferry from Säynätsalo to Lehtisaari. In the video filmed on February 6, a tractor load of gravel is transported on a ferry through the ice: