Thanks Gerd. After some more study, I'm convinced that it is a Siddeley-Deasy, perhaps an 18/24 from sometime in the time frame 1912-1915. I think my earlier date was probably influenced by the ornate style of coachwork. The initial registration date does seem unlikely, although this might somehow be a result of events relating to WWI. Perhaps a new car sat in storage for a long period, although 1925 seems a bit of a reach.