Hi scotmum,
Thanks for that info. DNA Colour Clustering seems to be for close matches (2nd-3rd cousins). But I only have four 2nd-3rd cousins listed on my Ancestry DNA, of whom I know which side they are on, along with only one 3rd-4th cousin who I suspect is on my unknown Mum's Father's side, who has not responded to my email. The majority are 4th-6th cousins (44 of them), of which 16 are possibles on my Mum's Father's side. The rest of my 450+ matches are classed as distant cousins by Ancestry.
Paul.