My tourer had the same problem . As miss moppet says water appears to get in the roof panels above where the hinges go into the body . I removed the moulding, put caravan seam sealer in but don’t seem to think have cured the leak quite 100 % but spare well dry!
No doubt it will be a discussion point with Elroy next time I see him . Ironically when Dave Linc’s owned the car ,when I discussed it with him he said he had never had a problem , Probably just thought he was filling the car with damp logs !