I believe it's the big limousine which is similar to the Jaguar XJ series. I had a Daimler once with the 2.5 liter V-8, but it too was the Jaguar limousine body MKII, a year or two before this Souvereign came out. The SP-250 had that same V-8 engine.
Once in a while I look through the Daimler book I bought around 1978/79 when I bought that '68 MKII for 800 British Pounds with another 150 BP in parts. Picked it up on a Friday afternoon in a suburb of London and drove it in streaming rain for 2 hours through London traffic, on the wrong side of the road... I still shudder when I think about the "roundabouts" to be taken clockwise...There have been few evenings where I have been so exhausted mentally as on that night.
Drove it to Germany the next day. Those were the days...