Thanks to all who replied to this post. I have tried a different relay and now everything is OK.

Could I recommend Parts Locator - the no1 autoparts directory

I joined it as a private subscriber (free), and put in an inquiry with the part number and very quickly obtained several hits.

AUTOLINE 0297574474, and another recycler on 07 37156 474, who both advise they have this part in stock. I got my replacement from a recycler in Geelong Vic. ($25 + $10 postage)

Cheers,

Lionel