METROPOLITAN LINE: Saturday 13 and Sunday 14 July, no service between Aldgate and Harrow-on-the-Hill and no stopping service between Harrow-on-the-Hill and Northwood. Trains operate between Harrow-on-the-Hill and Uxbridge, and between Northwood and Amersham / Chesham (via Watford). In addition, a Harrow-on-the-Hill to Amersham service operates, non-stop to Moor Park then all stations. CHILTERN RAILWAYS services operate normally between Marylebone and Aylesbury Vale Parkway (via Amersham). Replacement buses operate.