Alas, I’ve looked but I haven’t found Italian sausages with thicker mince. The meat in sausages here tends to be ground more finely, which makes them more like a paste and though tasty, it's not quite the same.
But I have found suitable alternatives. If you’re in London, Camisa on Old Compton Street in Soho has very good sausages in different varieties and Gazzano & Sons on Faringdon Road in Clerkenwell also has decent ones. Lina Stores on Brewer Street in Soho is another option.
Supposedly, the food hall in Harvey Nichols has an Italian sausage with a thicker mince but I’ve never tried them.
This summer I went to a BBQ at a friend’s and someone brought some South African sausages and they were very good. I’m not sure what they are called but there’s a deli in Stratford that sells them.