Have you got the hand brake rod (the part that goes across the back axle?) from a Mk2 Escort. Also the cable and clevis pins would be useful but it's the rod we really need.
Our local factor, Autosave of Bridgwater, can get Hadrian Panels pretty quickly.
Expressed Panels have a web site. Their panels are good but more expensive than Hadrian's; however they make some panels that Hadrian do not.
There is also Newfords Parts Centre (Google it).