Rob Morley wrote:

Why not just stick a bit of 2x2 behind the pine strips and mount the
doors using normal cupboard hinges like so?


Yes, that's what I might have to do but I would have liked to use the
already-cut holes for some clever kitchen unit style hinges if possible.
Having furkled in Screwfix and Toolstation I don't think it is possible
though.

Not to worry.

Si