I didn't raise the issue of Mittens this year, since I didn't think there was any guarantee it'd be safe or even legal on whatever date we planned. As we found last year, just because you have a booking somewhere, doesn't mean there won't be a lockdown in place when the booked date arrives! The UK is gradually coming out of lockdown at the moment, but we do have a larger percentage of the population vaccinated than anywhere else except Israel (45%); most of the Europe is nowhere near that number. That's no guarantee there won't be another wave, resulting in travel again being restricted.
Personally I think it'd be wiser to wait until next year, when almost everyone is likely to be vaccinated, and they've hopefully gotten it to be more like the flu vaccinations, where we get boosters for the new strains each time they arrive.