TfL provide a provisional list once every so often which lists expected closures up to six months in advance (see
here). Pencilled in for the May Day Weekend are:
Sat 05 May 12 - Mon 07 May 12:
District: Turnham Green to Ealing Broadway
Sat 05 May 12 - Mon 07 May 12:
London Overground: Clapham Junction to Kensington (Olympia); Richmond to Willesden Junction (Sun/Mon only)
Sat 05 May 12 - Mon 07 May 12:
Northern: Camden Town to High Barnet and Mill Hill East
Sat 05 May 12 - Mon 07 May 12:
Piccadilly: Acton Town to Uxbridge
Sun 06 May 12 - Mon 07 May 12:
Circle: Edgware Road to Aldgate via King's Cross St. Pancras
Sun 06 May 12 - Mon 07 May 12:
Hammersmith & City: King's Cross St. Pancras to Barking
Sun 06 May 12 - Mon 07 May 12:
Metropolitan: Baker Street to Aldgate
Sun 06 May 12 - Mon 07 May 12:
Victoria: Service suspended