Photos need to have been taken in at least 1957. I believe that was when the FE wagon (Station Sedan) was launched.
I only just noticed the the FC is replaced with something else in the third photo.
It does look a little like a Mercedes, but I pretty sure it's something else.
The finnie's

(what a great name) started in 1961 and it's not one of them. The Roundie's started in about 1954 and still had a full guard, no arch on the guard. The earlier models had an arch but it was a slow arch going back to the rear door. The arch on the guard in the photo cuts down to quickly, doesn't have the big gap between the headlight and the grill and has a split windscreen.
I was thinking an english model of some type.