just found out that the tape is at my brothers house 100 miles away. I'll get him to send it up to me. Once I get it, i'll certainly get a sample of the audio to you.
I've got a VHS of the 1982 ITV broadcast of ANH with the fox fanfare intact , i'm not sure if it has the full end titles. I also seem to remember it having an announcer saying "the british network premier of Star Wars" at the beginning (although that just could be a false memory).
If this will be of any use to anybody, I'll dig it out and see if i can get it on to dvd-r.