I do hope they've also identified and spoken with the people in the background of the 'witness lady in a red coat' Ring photo that the police issued when they were asking said person to come forward. I wish I could find (refind?) confirmation of exactly what time that photo/video still was taken, because to my (photographer's) eye, it really does look suspiciously like a tall man with his hand/arm on the shoulder of a blonde, much smaller woman who has her head hanging downwards in a very subdued-looking manner, on the other side of the road to Red Coat Lady. IMHO.
(Link to an article including that Ring camera frame) -
Police have released a timeline of Nicola Bulley’s last known movements
www.independent.co.uk