I'm making a sauce for Mary berry's sticky toffee pudding but my double cream has gone off. Can I substitute for anything else? More milk? Cornflour? [[https://www.bbc.co.uk/food/recipes/marys_sticky_toffee_41970/amp https://www.bbc.co.uk/food/recipes/marys]][[https://www.bbc.co.uk/food/recipes/marys_sticky_toffee_41970/amp sticky]]y_[[https://www.bbc.co.uk/food/recipes/marys_sticky_toffee_41970/amp toffee_41970/amp]]