Posted: 16/04/2015 at 22:13
Your biggest problem will be getting curved panes for the roof edges.
Most on line stores will not send glass through the post and buying from a local glass shop is expensive, as you've read. I had a square edged GH and purchased a full set of glass from B&Q several years ago it was just over £100 for a 6 by 8, I did have some glass though, that was several years ago and at that time they only sold full sets at a time which is several packs. The end triangular pieces did not fit, so these were cut by the local glass shop at a small cost. I'm talking less than £2 per pane.
It worked out far cheaper than buying a new GH.
If there is a place sellling GH's locally with curved edges you might be able to negotiate just buying the glass.
A standard GH has standard sized glass which fits most, me thinks it's either 60 by 60 or 61 by 60. You would need to measure the spaces between the frame sides to check the sides of your GH as I'm not sure if yours is standard.
Sorry can't be more helpful.