The first reading isn't on file yet. We read menus the same way everywhere: medians and confidence, no venue names.
Public-facing menus, collected twice a year. No surveys, no submissions for a fee — the menu is the source.
A fixed list of canonical dishes and drinks, matched against every menu we read. United Kingdom's canon will carry its own local staples alongside the shared core.
Median, not mean, always beside its sample size and spread. Regions, never venues — an index reports on places, not tenants.