On 17/04/2019 18:46, Andy Burns wrote:
ss wrote:

put a spanner on the square spindle, levered up the door and then
thumped the spanner.....door opened.
Still not sure what the issue is

Sealed units not properly heel'n'toed causing the door to sag out of
square?

http://www.suttonlocksmithsandglaziersofhull.co.uk/images/door-heel-toed.png


You may well be correct as a quick visual looks out of square, I think I
will try adjusting the hinges then check the mechanism and take it from
there.