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Cheers, looks a bit expensive for one window. Removing the glass is a possible but the bigger the scope of the job the more chance I'm just going to get someone to do it.
There is a big stone cill underneath so that may be a possibility. Will have to have a closer look.
aggi-
A length of 2x4 with a block screwed to one end to capture the bottom edge of the sash and a friend to use it as a long lever can probably take a useful amount of the weight.
Even using it regularly, the sashmate was an expensive purchase. It helps a lot, but you still have to lift the sash inside which is the awkward part.
At 1m sq, I'd probably take the glass out if the glazing beads seem easy to pop free.If you have any smaller windows with less than perfect hinges, practice on one of them before attempting this one.
A temporary solution to get it closed unless this is a daily use window, would be to pull the top corner in as you close the window. Really needs a suction cup, or push against it from outside. once fully closed, they usually stay there until next opening.
user69121
Without access to a Sashmate, removing the glass could be a sensible idea if it's internally glazed.
https://glazesafe.com/sashmate-user-images/
If there's a window cill just below, you can often slacken the bottom hinge screws sufficiently to allow the hinge track to pivot around them. Remove the upper screws and allow the top of the sash/hinges to go outwards and guide the bottom of the sash to rest onto the cill.
Undo the two remaining screws and bring the sash inside.