automation 19 · computed here
Seasonal opening switch
The winter timetable applies itself on the date you set.
English Heritage
Winter opening runs from around the start of November to late March, with a full week returned at February half term. Every one of those dates is a chance to publish the wrong hours.
https://www.english-heritage.org.uk/visit/
TriggerOn the switch date
seasonal
The figures below are calculated in this page when you press Run.
The half-term exception is the reason this exists. Every seasonal timetable has one, every published version misses it, and a visitor who drives an hour to a gate that says closed does not come back. The announcement runs a week ahead, not the day after.