Dolce Rosso Tomatoes?

We had some wonderfully sweet little tomatoes while in England last month. They were Dolce Rosso tomatoes from Morrison's grocery store. A quick search for seeds has been fruitless. Will look again when I have more time. Someone on a UK gardening board mentioned they'd had nice plants grown from the seeds of the store bought tomatoes. Wondering if "dolce rosso" is a supermarket name? Are they known by something else?