Is this cull imminent? I would not think so. They can't relocate them right now, because they will be looking for somewhere to hibernate and will not find it in strange surroundings.
Where would they move them to? Everywhere that can support a hedgehog will already have its quota. A lot of those relocated die of starvation, or eat up the resources so that the original resident dies.
If they are all descended from three ancestors, they must have some seriously inbred genes.
It is said to cost £1,000 for each one relocated.
Just putting a few rational points. I don't like the idea of the cull either, but is the alternative feasible?