In Britain, if you want biscuits and gravy, you would ask for "scones and gravy."
It's important to note that the term "biscuit" has different meanings in the United States and the United Kingdom. In the US, a biscuit refers to a fluffy, bread-like baked good typically served with savory dishes or used as a base for dishes like biscuits and gravy. However, in the UK, a biscuit is a sweet, crisp baked good similar to what Americans would call a cookie.
In the UK, a scone is a baked item that is often served with tea or as part of a cream tea. It is a slightly sweet or savory pastry that is similar in texture to an American biscuit. While scones are typically enjoyed with jam and clotted cream in the UK, if you specifically wanted scones served with gravy, you could request "scones and gravy."