Be sure to buy plum toms, not just chopped, Jon, and ones with salt or anything else added are best avoided, I've found. I'm not keen on Napolina ones (not quite the Italian company you might think!). Cirio are OK (and I use their passata quite a lot), but they are no better than the Waitrose ones and are more expensive. All a matter of taste! Whatever else, I've noticed that prices of such stuff are seriously on the up...