I make a pizza from time to time (never the base), but I made a mistake recently and bought a pack of bases with neither tomato/herb sauce nor cheese, The next day I happened to be in Asda, and asked one of the assistants if they had grated mozarella. He said that he thought that they did, but when he came to look, there was none left. What there was, however, was "Asda grated four cheese blend", containing grated mozarella (45%), grated coloured cheddar (23%), grated Maasdam (16%) and grated samso (16%), so I tried this and the results were superb -- a beautiful melting/stringing blend that works and tastes perfectly in pizza.. Highly recommended.
** Phil