The DCs would probably be happy with a longer train journey by now and DH is concerned about the safety of flying in the next year given what flights seem to be like now.
We have flown to Nice before but they both did, to be fair, struggle with the heat quite a bit.
Where could we have a similar (city type break, good deal to do, scenic and no need to have a car) holiday in a slightly more temperate part of France?