The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Happened as dated, per macrumors.com: "…rs of being abandoned, with a predicted opening date for Apple's offices expected sometime in 2021.…"
TechCrunch reports Apple is "opening Apple's new London campus at The Battersea Power Station in 2021," matching the pin's stored 2021 target date for the roughly 1,400-employee consolidation.
The Apple Post likewise states the campus is "expected to open in 2021," corroborating TechCrunch's[2] same-day reporting and the pin's stored date.
Something missing or wrong? Say it in your own words: a link that backs this pin up, a different start or end date and why, or a fact it lacks or gets wrong. The AI checks it against this pin's sources, searches for better ones, and adds any page that backs you up. The pin's own sources still count most.