Hello biffa bacon,
Bill told me already some details about your issue, please don’t worry 
Unfortunately I don’t know a Strida mechanic at your location, but an experienced bike mechanic shouldn’t have problems to remount and perhaps adjust your brake properly.
I’d suggest you look for a communicative, older and English speaking mechanic - (s)he may want to ask Bill or me in the case there are still questions left over.
Maybe you prefer to speak German?
Best regards,
Chris