Glass in the solent area

Hope it's helpful , but have you tried one of the emergency call out window repair people ? they sometimes carry the stuff for late night repairs to shop windows
 
If it's just a flat piece you need, try the Glass & Mirror Center, Kingston Rd in Portsmouth.

I've had flat perspex from this guy before & he's very helpful. He even hand cut a small round piece of glass for me when the front plate of my Walker Log got cracked.
 
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