Hi Iain, It's a good idea indeed. We purchased the Autodata discs this year at a cost of over £250.00 and to be quite honest, we found them very patchy indeed! I have thought of going over to ESI wiring and workshop data for a while now, and I think that will be our next move! We try to get as many dealer discs as poss and have a lot of other forms of wiring diagrams, ie: books, loose leaf etc. Let's face it, you can only realy test a component or circuit correctly if you have the right info to start with! I only just subscribed to Erwin last week, so I'll see how their diagrams and info are as well. All the best, Gunner.