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Big thanks @Airhead, this is what housemate came back with:
Two coats of Zinser 123 bullseye primer. Applied with a brush. We did exactly the same on the test doors and they were fine. Current guess is maybe when we wrapped the brush with clingfilm between coats. Perhaps clingfilm has some coating that is reacting with the paint??
Mishk
@Airhead
Looks like water based paint. Kitchens are greasy places so you have to be careful with prep. It's why a lot of kitchen painters stick with oil based paint. You can contaminate sand paper with grease so that it just embeds it in the surface. Also check the quality of the primer (it is primed right?), I usually use 2 coats on water based kitchen jobs.
Then you can get very ugly results from water based paint just from the application on flat surfaces so it's best to use a top quality paint base like little green, which is a 3rd generation water based paint and apply it with a brush that's engineered for the job, something like a wooster alpha. In any case, even with perfect conditions, tool, paint and lots of experience it's a pain.
You should probably clean all used kitchen doors with meths or white spirit at the start of the prep.