Based on my search, “Pure Dead Brilliant” is not a dedicated restaurant name in the UK.

The phrase “pure dead brilliant” is a popular Scottish idiom meaning “exceptionally good.” It appears in several different contexts, which may be why you encountered it in relation to food or menus:

• Takeaway Listings: There is a takeaway delivery listing on platforms like Uber Eats under the name “Pure Dead Brilliant” that offers a wide variety of standard fast-food items (pizzas, burgers, kebabs, etc.). This is likely a generic or placeholder name used by a kitchen to sell multiple types of takeaway food.
• Literary Reference: It is the title of a well-known children’s book in the Strega-Borgia series by author Debi Gliori, which is set in a gothic castle and features various magical—and food-related—events.
• General Use: The phrase is commonly used in Scotland to describe anything of high quality, including a particularly good meal at a legitimate restaurant (such as reviews for the Garvock House Hotel).

If you are looking at a specific menu or delivery app, you are likely looking at a multi-cuisine takeaway kitchen that has adopted this local Scottish slang as its business name. Given the wide range of items (pizzas, Indian-style burgers, kebabs, and ice cream), it is a classic “all-in-one” takeaway menu rather than a specialized restaurant with a singular culinary focus.