Hi there effectdigital
Thank you so much for taking the time to respond to my question, much appreciated.
I have only ever used the .co.uk. domain. The .com has always just been a parked domain name I own that has always redirected to the .co.uk. I have never hosted any content on the .com so I am mystified as to why these links appear.
With regard to your point 2. I have moved my website and by moved I mean, killed the old one and rebuilt a totally new one. No link architecture update or anything like that. There should be no links to the old site, even if there were they would be .co.uk ones.
As for spam scores on the old site I never collected that data. I only just joined Moz!
I think the only thing I can do is follow your point 10 and redirect them.
Thanks again
Poppy