Edward W. Thompson wrote:
I recently had 'replacement' Windows (PVCu) and a front door fitted by
a FENSA registered company. The windows were fine but the front door
leaks like a sieve as is does not completely mate with the seals
either outer or inner. The simple reason is the door is slightly
'warped

I don't think pvc doors "warp" but, if the frame was distorted during
installation, it would look that way