So I finally came home from work early enough yesterday to take my new food processor out. I found a basic shortcrust pastry recipe on BBC, though it didn't make quite as much as I would have liked so the pastry was rather thin.
Here's the recipe that I used for the filling:
4 white mushrooms, chopped
100 g baby spinach, steamed and drained
3 large slices of deli ham, chopped
Pepper and Thyme for seasoning
Scatter all the meat and veggies into the cooked pastry crust. In a bowl, whisk eggs lightly and add cream, pepper and thyme. Pour the egg mixture into the crust and bake 40 mins at 200C. Top with some grated cheese.