The United Kingdom changes between GMT and British Summer Time. Record the date and zone when scheduling or comparing posts so a seasonal one-hour shift is not mistaken for a content result.
English-language content can also reach viewers outside the UK. Use the account's genuine audience-location and activity data before choosing a publishing window, and keep supplied package counts separate from local reach, enquiries and sales.
Agencies and brands should document purchased activity as its own input. A larger public count is not evidence of UK residency, customer demand, advertising compliance or campaign success.