HERA study question

I am, unfortunately, having problems with the follow-up care in the HERA study center here in Germany, hostile doctor - probably overworked, saddled with the HERA study patients and anything but helpful. Now I can't even get my test results from the check-ups. She doesn't answer e-mail, has no office and is essentially unreachable by phone, even her pager is very tricky.

I have been in touch with a doctor at Hofmann-LaRoche who is supposedly in charge in Germany, but he is surprisingly ineffectual - and possibly because he insists in communicating in English, though my German is fine, his answers are obscure to say the least.

I would like to contact the Bristol office which is coordinating the study and discuss the situation, but I can't find any address. Does anyone have the information, or a suggestion about how to look? I found a description of the study on the Clinic Watch ( I believe) site, which confirmed the Bristol location, but gave no address.

Thanks for any help,

Tessa