METROPOLITAN LINE: Saturday 26 and Sunday 27 October, no service between Aldgate and Harrow-on-the-Hill / Northwood. Trains operate between Harrow-on-the-Hill and Uxbridge, between Harrow-on-the-Hill and Amersham (non-stop between Harrow-on-the-Hill and Moor Park), between Northwood and Amersham via Watford, and between Northwood and Chesham via Watford. Replacement buses operate, and CHILTERN RAILWAYS services will operate between Marylebone and Amersham.