I can suggest that you try newton and ellis, they are in Liverpool, and take postal cameras, sorry I can't remember the link, but I have sent a lot of camera equipment to them, both ancient and modern, and they have never let me down yet, Expensive mind you, but they seem to be able to repair pretty much any photo equipment,good luck with the Zenit, if you treat them nicely they are built like a brick outhouse, I had 2 or three of them in my earlier years of photography.
Richard
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