You'll finish at

Mercato Mayfair

Mayfair food hall · church conversion · post-park feast

Converted church, multiple vendors under one roof — good landing after a long park loop when you want options rather than one menu.

Royal Parks to Mercato Mayfair.

Start in Westminster and thread through the city's best green corridors: Churchill War Rooms, St James's Park, Green Park, Hyde Park, Marylebone, Regent's Park, and Baker Street. The finish lands you at Mercato Mayfair in a converted church on North Audley Street — exactly the kind of reward a 15k deserves.