Hhell in Exeter I used to find passata Valfrutta (at the deli) or I'd buy Sainsbury's organic passata (very good). I couldn't find Mutti, but you might in London.
Molars can be really nasty, though I have to say that they didn't cause my dc many problems. But mil claims that she still remembers when her second ds grew them as a nightmare...
I must confess that I'm a huge fan of kinder as they remind me of my childhood, therefore are the only merendine I buy. They are also quite small, so I think one merendina kinder + an apple (or strwberries) is a good merenda.