Piccadilly Line: No service between Rayners Lane and Uxbridge due to poor rail conditions caused by significant leaf fall. SEVERE DELAYS Arnos Grove to Cockfosters and Acton Town to Rayners Lane / Heathrow Airport due to an earlier signal failure at King's Cross St. Pancras. MINOR DELAYS on the rest of the line.ondon Underground tickets will be accepted on London buses, Elizabeth line, Great Northern and London Overground.