Neil wrote:
Can someone confirm to me if new internal doors (bare wood) do not need
to be prime, just undercoated and the one coat glossed, I've got lots
to do so, I'm trying to shave time off the job.

1) You'll need to apply knotting, if the doors have any knots.
2) You ought to apply primer, use a small roller for speed.
2) Apply undercoat with a roller, lay off with a brush for a
superior finish. De-nib with fine glass paper.
3) Apply gloss with small roller. Lay off with a brush for a
superior finish.