Standards

Editorial standards

A number, ratio, fare, promotion or expiry rule appears only when an official source supports it. We name that source, link it when we can, and show when we last checked it.

When we are not sure

• Not yet confirmed — we have not checked the fact on an official page.
• Checked — a named source was compared with the page, and a last-checked date is shown.
• Disputed — sources disagree, and the page says so.

Changes

A change can be recorded before we write a full guide. We quote what the scheme said, with the date, and we do not fill a gap with a guess.

Corrections

A material correction updates the page and does not silently replace the previous figure. Write to us from the contact page.