Seen and photographed by my wife. A Small snake, maybe 1 foot long and 1cm in diameter. Basking in sun beside footpath.
No interactions present.
It was thought that these were a separate species, the Dwarf Red Adder.
They become more "normally" coloured as they mature.
Lat/Lng: 52.432652, 0.725122
OS grid ref: TL853851
Seen adjacent to the footpath on a forest trail in Thetford forest on the route between Brandon and Thetford.