Where to get hold of old windows/glazing?

Am building a DIY greenhouse on the allotment from salvaged timber, would like to get hold of some old windows/glass to incorporate into the structure to keep costs down. Anyone know where to source materials? Googling it proved pretty useless, am thinking of ringing up window companies and asking if they have any?

I wouldn't ring but just call round, ready to pick up there and then.

I have a feeling that if you ring up, they can't see who you are, and it helps a lot to show a face. Certainly I've been far more successful that way.

Good luck with your build!

Just call round to local places, alot are glad to get rid of it as they sometime get charges, its exactly how I built mine

Re-hosted a couple of the pics

Full windows including frames are better for the sides as you can just screw them together instead of having to make a wooden frame for them, and the bigger they are, the easier it is so try using french windows etc