So at just after 5 pm today I was tidying my kitchen and looked out the window and saw 3 "robins" fly into my mountain ash tree. I noticed one was slightly smaller and grabbed my binoculars. It was very curious to me - it had a mask-like face, more buffy/peach-coloured flanks, and a paleish belly. There were no spots on the belly or breast.
It grabbed a mountain ash berry then seemed to have been chased off by one of the robins.
It was clearly a turdus thrush but not an American Robin. I did a Google turdus search and Eyebrowed Thrush seems to fit exactly what I saw.
It was only there for about 20s and I didn't have time for a photo. I watched for about 10 min then went outside to look for another 10 but despite finding at least 8-10 robins, I couldn't relocate this bird. Sadly I then had family commitments
Hopefully, I can get out and check tomorrow. If not I'll be watching out the window every chance I get!