Piccadilly Line: No service between Wood Green and Cockfosters, and between Rayners Lane and Uxbridge due to planned engineering work. Severe delays between Acton Town and Heathrow terminals due to an earlier signalling problem. Tickets are being accepted on the Elizabeth Line and London Buses. Minor delays between Wood Green & Acton Town, westbound only, while we deal with a customer incident. GOOD SERVICE on the rest of the line.