Thanks Xavier! I think that is now the whole tape complete! I compared all of the .p you sent to the versions I had half-extracted from the tapes and everything checks out of course. I can't believe how I missed some of the easiest clues but your detective work is amazing!
With Tresor Trail (I can't believe I missed Gold Rush in the listing!) I notice that the listing is reprinted here (with a .p file) and the website owner had made a small change to the programme (I guess to make it run): http://www.users.globalnet.co.uk/~jg27p ... _name8.htm
Thanks again, Will