Hi @blueand white and welcome to DTP.
I thought I would draw your attention to the fact that the post you have quoted is from 2013 and there have been updates to CRAG since then - in particular where is comes to how homes that are owned by more than one person are valued.
I am not sure about the exact details and I hope that someone with more knowledge will post, but I do know that the particular clause you are talking about has been changed
Thanks for responding I'm just starting out with this journey, there seems to be a lot of information to take in not all of it clear, I downloaded CRAG from the gov.uk portal if anyone can offer advise I would be grateful.