My problem seems to be finding an enabled disc.
After the failure of both the 2001 and the 2014/15 discs I downloaded and burnt the one from the link given in this thread:
https://the75andztclub.co.uk/forum/s...d.php?t=283644
Still no luck though.
I will try taking a look at the files on the discs when I get home.
I just found this list of TMC codes which may help:
wiki.openstreetmap.org/wiki/TMC/Event_Code_List
I may try opening the files on the disc in a hex editor and searching to see if i can find any.