Discovery Service Guides - Online Ideas?

Having convinced the family that we NEED a Discovery as the 10yr plus 300s are now affordable (to buy, if not to run) I Im now the proud owner of an N plater with 124th on the clock.
Can anyone point me to a useful site for service guides and workshop manuals - this is the firstDiscovery I have owned - I have a SIIA 1968 109 with a transit diesel atthe end of the garden.
I would appreciate anyones thoughts on the best guides that are available free and the obvious things to look for
Any help, much appreciated

welcome, go down the page a bit into the common faults bit and look for the post "download Rave cd" it is what the dealers use.