Sunbeam 3-litre

This car's pictured in the Exchange Station car park in Manchester approaching the start-line of the Manchester to Blackpool Veteran and Vintage Car Run in June 1990.

It's John Tattersall's 1925 Sunbeam 3-litre, except that the short entry in the programme seems to cast doubts about the engine capacity:

138     1925 Sunbeam 3-litre

            Reg: YN 7831  6 cylinder  3,500cc

            (John Tattersall, Burnley)

I've looked through all the pre-war Sunbeam cars and the nearest I can find to 3½ litre engines are the Sunbeam 25 of 1927 to 1932, which was 3618cc, and the Sunbeam 20 of 1931 to 1933 and the Sunbeam 25 of 1934 to 1935, which were both 3317cc. I suspect the figure in the programme was a misprint - the Sunbeam 3-litre actually has a capacity of 2916cc.