Singer Sophie Ellis-Bextor, food critic Jay Rayner, presenter Alex Zane, hotelier Ruth Watson and TV personality Cilla Black join Heston Blumenthal for a Tudor-style dinner. Dishes on offer include frog blancmange, bone marrow rice pudding and an edible mythical monster - inspired by one ordered by Henry VIII to impress the king of France - with the head of a pig, the body of a lamb and the tail-end of a goose