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They look delicious tim.I'd not heard of it either Debs, but seems it is also known as Big Beef http://www.pelicanplants.co.uk/tomatoes-a-z/big-beef
I believe Big Beef has been de-hybridised by some who liked it, but the seeds I have for it are the original F1 variety.Have you a link to Mr Simpson breeding Jack Hawkins, all I can find is a variety they sell as a plant called John Hawkins.
No you might be right, I found a post on I think Jamie Olivers forum which said Simpsons bred it, but can't find anything else.