It was entered as a 1959 107E Ford Prefect driven by Alan Mann's son Henry and has also been driven by Mini racing chef James Martin, not sure of spec.
The HSCC will allow side-valve 100E models to be fitted with pre-crossflow engines of up to 1300cc.
(The 107E had a reworked 100E body with the new 997cc overhead valve engine, four-speed gearbox and 'banjo' style rear end from the Anglia 105E, produced to offer a four door model from 1959-61)