All ingredients are readily available at Tesco, Sainsbury’s, Waitrose, ASDA, and Morrisons. Ricotta and cream cheese are in the dairy section, sugar and all-purpose flour are in the baking aisle, and graham cracker crusts (or digestive biscuit bases as an alternative) can be found in the baking or biscuit section. Lemons and vanilla extract are in the produce and baking aisles, respectively.