The vegetarian pasta option on the order menu is described as:
Organic penne pasta - Sun-blushed tomato sauce, rocket and Parmesan.
so obviously not vegan. I guess you could ask for the Parmesan not to be served, but I suspect that it is pre-packaged.

The only things I could add are bread products. Now these aren't labelled and sometimes milk or milk powder is added to bread (certainly is when I make it) but commercially that's rare these days. Also the prepackaged nuts, crisps and biscuits often will be vegan and labelled accordingly.