Thanks guys,
You're quite right Gary, these wiring diags are difficult to follow so I copied it to mspaint and coloured the relevant connections.
Thanks Alan but if you look at the "colour enhanced" diagram I have attached from my workshop manual, you can see that the Right headlight is powered directly from the switch which also provides the power to the coils of the headlight relays. The Left headlight is powered by the relay contacts, as is the high beam indicator. The red and orange traces show the power sources.
Allan