All this talk of Colchester Speedway, are people not confusing it with Chelmsford?
The Guilfoyles opened a training track on their farm at Little Waltham, Montpelier Farm which is on the Chelmsford to Braintree road. It is mentioned in the "Homes Of British Speedway" book.
Johnny Guilfoyle is a former West Ham and Rayleigh rider and Rye House promoter, while his son Laurie rode for Hackney and Rayleigh. The book states that they were brothers, which is incorrect.