Metropolitan Line: No service between Chalfont & Latimer and Chesham while we fix a signal failure at Chesham. NO SERVICE between Moor Park and Watford while we fix a signal failure at Watford. SEVERE DELAYS between Harrow-on-the-Hill and Aldgate / Uxbridge due to an earlier fire alert at Willesden Green. GOOD SERVICE on the rest of the line. London Buses are accepting tickets via any reasonable route.