BIG PROBLEMS TODAY..........
thanks for further thoughts - please throw as many 2 pences in as you can to help...
anyway, today did not go well unfortunately.
Managed to unscrew the window and safely manoever in. Took a little while but now having done it it will be easier on the second window...
Replaced the hinges on window 1, both arms located in the extrusion channels and 2 of the previous holes lined up well on each arm.
There was a little slider block in the lower old hinge slideway that had broken which could have accounted for that pivot pin moving out from its centreline and also the fixing screws had loosened a bit but not enough to account for the amount that the window didn't pull in.
Bad news is that the hinged side of the window is not pulling in any better, in fact worse, with about 8-10mm gap all the way up - can't understand this as the new hinges should be aligning the window and frame correctly unless there is something fundamentally wrong.
Also, the egress type hinges that I have now fitted don't allow an access gap now to clean the outside - the previous hinges were not egress type - I believe you can get egress+cleaning opening hinges as an alternative which maybe would be better in fact.
Anyway, didn't bother starting the second window, and have left the ill fitting new hinges on the first until I sort what to do next ??
The new hinges are well lubricated already so I don't think that is an issue now.
Adding some picture of the lower hinge fitted and the old hinge held alongside - any thoughts ???