Added January 2010: I've just noticed the Leyland Workshop Manual ('chassis number 410002 on, 1977') and Haynes ('later UK models') have slightly different schematics for late-model cars. This is the Leyland version, possibly up to 1978.

Note 1: There are two separate green circuits - the original circuit fed from the 2nd fuse up in the 4-way block for all the original green circuits, and another fed by an in-line fuse from the white/brown circuit on the relay contact for the cooling fan.

Note 2: There are two separate white circuits - one from the ignition switch feeding the ignition relay, the other feeding the fuel pump and ignition warning light taken off the white/brown circuit from the relay contact.

Note 3: I've seen round black relays on a 1980 UK model with ISO terminal numbering as follows: