There was a crooked man, and he walked a crooked mile,
He found a crooked sixpence against a crooked stile;
He bought a crooked cat which caught a crooked mouse,
And they all lived together in a little crooked house.
So across a maximum door opening of 900mm the head is 10mm out of level.
(or the ceiling is or the architrave is)
The maximum allowable using the NHBC "A Consistent Approach to Finishes" is 5mm!
(See the link in my earlier reply)
For the window glass to be 30mm smaller one side to the other is most certainly not "fine" and whilst it may be "not unusual" on this Harron Homes site, it is very unusual generally.
Who is the site manager? Tom Jones by any chance?