Surfing around the interwebs last week, as you do on a rainy day, and I found myself on the Lambley Nursery website looking up tomato seeds.
You wouldn't believe it but there on the page is "Stewart F1", Tomato seeds for sale.
There was nothing left to do, but hit the add to cart button and get me a packet.
To add to the attraction it claims to have Terrific disease resistance as well.