I am pretty sure that all is OK at the plug end - I suppose I could do a continuity test from the pin to the speaker terminal...
The other thing I have not yet tried is taking the door cards of and checking that the speakers are actually plugged in still.
Might be a schoolboy error, but the chances of both front woofer and tweeter and the rear speaker being unplugged are pretty remote.
I suppose I am asking whether anyone knows if the speaker part of the loom has any connectors in it or does the wire run straight from plug to speaker with no interruptions? For example, I assume that the front right splits in two to supply signal to the woofer and tweeter.