I’m happy to report that D7 was the culprit. I’ve replaced it today and my washer/dryer is now working again.
A big thanks to all of the people who came up with the fix and all who have contributed to this post. My model (WDX8543130W) was not in the title of the post and was found several posts further down.
I can’t beleive that a little time and a £0.20 part fixed the issue so quickly.
Steve