Three babies have been born after receiving the landmark treatment in the US.
The Royal College of Nursing is balloting all its UK members for the first time in 106 years.
Families of some of those affected are giving evidence at a public inquiry into the treatment disaster.
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.