On Fri, 10 Nov 2017 11:19:41 -0000, "Bert Coules"
wrote:

The flooring runs under the kitchen units all the way to the wall. A
laminate fitter examined this and suggested that rather than lifting and
replacing the plank it would be possible to drill a small hole, squirt in
expanding foam and then weigh down the floor until it had set.

Expanding foam when expanding exerts a large force on constraining
materials and is quite likely to lift the floor no matter what you try
to weigh it down with. Moreover, in a confined space it will not set
quickly and could easily continue to expand for several days.