It looks Aston-Martin-ish
That's because it's very closely related..
Lagonda DP166 1955 (Dennis Poore at the wheel before scrutineering at Le Mans 1955)
..but this is indeed what it is.
It started life as Aston-Martin (DB3?) chassis DP115/1 but then became Lagonda DP166/1 with the V12 engine for just one outing, at Le Mans in 1955, where it ran for 93 laps before retiring.
After that it metamorphosed again into Aston-Martin DBR2/1, chassis DP 115/3!