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Gap is in the bottom right corner - sounds like it might be your last suggestion then as they're top hung. Any idea if fixable myself? Happy to sort myself if feasible
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Jamwam
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If it's a basic two mushroom espag lock, the way the handle moves will tend to push the sash across to the left.
The packing of the glass should support it with two packers underneath and another above prevents the top rail sagging. The two vertical packers resist the locking force by transferring it up to the hinges.I add a bit of CT1 to hold my packers inplace.
Glazing knife for removing the beading.
Glazing shovel for levering the glass/frame.
Packers. Mixed bag from screwfix.
Nylon or rubber mallet. May not be required unless you don't have one available!There's lots of videos about replacing glass
user69121
If that's an outward opening window, with friction hinges and the gap is in one of the hinged corners, then definitely new hinge time. If the gap is on the side or the two corners with the locking mechanism, then the mechanism isn't pulling the sash tight against the frame... or the sash has been pushed across by the the action of the locking mechanism movement.
If it's a tilt and turn, it probably needing some adjusting.