John Rumm wrote:

Do you have a spare plank?

If so, cut the existing one out (circular saw set to depth of plank). Cut
inside the perimeter all round. Then break out the remaining edges. Level
or fix the floor under, then fit new plank having chopped off the
underside of the grove so that it can be dropped into place on a bed of
adhesive and weighted down til set.

Thanks for that. The idea of sawing through the laminate, even with the saw
set to its thickness, is rather daunting - just as the professional fitter I
consulted was daunted by drilling into it - but I can see that it might be
the best approach.

However, as I just wrote in a separate post, I'm beginning to have doubts
about the whole kitchen area.