Updated 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 Haynes version, possibly from 1978, definitely for 1980 models.

Note 1: There are three separate green circuits - the original circuit fed from the 2nd fuse up in the 4-way block and two others each fed by their own in-line fuse - one from the white/brown circuit off the relay contact feeding the coolin fan switch, and one from the white from the ignition switch feeding indicators, heater switch, tach, and heated rear window switch.

Note 2: There are two separate white circuits - one from the ignition switch feeding the ignition relay, coil and the in-line fuse for one sub-set of the green circuits, the other feeding the fuel pump and ignition warning light off the white/brown circuit from the relay contact.

Note 3: There seem to be two separate white/brown circuits - one from the relay contact to the fusebox etc, the other from the coil white feeding the in-line for the heated rear window etc.

Note 4: I've seen round black relays on a 1980 UK model with ISO terminal numbering as follows: