I bought a very similar (maybe identical) swan in a Copenhagen second hand/ antique centre in 2012. I too thought it was by Burtles & Tate and listed it as probably that although it had no maker's marks. I was also challenged by someone (a Northern Ireland based person) who said it wasn't by B&T but can't remember who, or if, they said they believed it was by. They did buy it for somewhere around £60.
Alastair