Bought a Vag-Com lead off ebay and tried the shareware version of the software. Superb.
Liked it that much that I actually sent them the money and bought a licence. (With a c).
This enabled me to reset my throttle body which was casuing a dodgy cold idle. Then after I had done that, I could log a start up and check that everything was in range. Which it now is. Logs are saved in excel format as well.
All you really need these days is a 13mm spanner, a hammer and a laptop.