Hundreds of patients who have waited two years or more have already said they are willing to travel.
What do these cases really tell us about the virus, which hasn't spread in the UK for decades?
The increase, with an estimated one in 35 people testing positive, is being driven by newer variants.
Other groups have reported higher protection, but the results are still seen as a triumph.
A question everyone's asking: what's my Covid risk? Here's how to find out.
Borrowing - which hit a record £22.3bn in October - cannot go on indefinitely, chancellor says.