The lights arrived from Germany. They are exactly the same as the original ones except the letters around the edge of the lens are slightly larger and the vertical lines in the glass are slightly closer together. I will replace both of mine so they match but most people would not notice the difference as its very slight and the Tickford surround covers most of the lettering anyway.
The new lights come complete with back, globes and wiring exactly as per original.
Suppliers contact details as below. Price was 67 EUR each plus around 50 EUR for 2 week freight.
O S C A R S I E B E R T K G WERKSVERTRETUNG FÜR INLAND UND EXPORT
Tel. 04532 / 7097 E-Mail: Internet: Elmenhorster Str. 14 g
Fax 04532 / 5844 service@os-kg.de
www.os-kg.de 23863 Bargfeld-Stegen
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I can only conclude Tickford had a German engineer who setup the lights ands familiar with ZKW lights as why they used such an obscure ZKW light rather than something local.