UPVC Back Door replacement panel?

[Caspar]

Hi
My back door has a double glazed glass top half and a solid panel bottom half with a leaky cat flap in it which I don't need.
Where can I obtain a replacement panel to fit to eliminate the draughts in my kitchen?
Or maybe I could use some upvc material to cover the cat flap hole?
Thanks for any help.

 

[jackplane]

found this lot on tinterweb...never used then could be worth a phone call

http://glassandlock.co.uk/index.html