bp wrote:

I cant fix the boards in situ - they are too far gone.

With a small circular saw set to board depth cut away a board leaving a
small margin at each of the joins. If it is click together stuff then
the remaining bits can be pulled free. If glued, then use a chisel at an
angle to knock the remaining wood away from the glueline. You will need
to rip the lower part of the groove away from the replacement boards to
be able to get them back in the hole. Glue in place (even if it is a
click together floor system)

--
Cheers,

John.

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