1. Tube rush-hour chaos as Circle line suspended and delays on others – live  London Evening Standard
  2. London Travel Disruption This Week: Full List of TfL Tube and Train Closures for May 19-22  Time Out
  3. Severe rush hour delays on major London Underground lines after signal system failure  Metro.co.uk
  4. ‘Severe delays’ as Watford train line part suspended  Watford Observer
  5. Entire Tube line suspended, two more part suspended and two delayed  MyLondon