Chairman comments on findings
Less than a quarter of the marshals registered for the TT come from the Isle of Man.
Robert Craine, the chairman of the Isle of Man TT Marshals Association revealed the figure while speaking about the association and marshalling in general on Sunday Opinion.
He says he didn't expect it to be as low as it is:

MHK to assess level of support for chief minister bid
iMuseum: "It's absolutely our intention to reinstate online newspaper service"
IoM Government to consider impact and implications of UK triple lock changes