Major changes

Birmingham - Stratford-upon-Avon - Banbury - High Wycombe - London Marylebone:
 

Wireless Festival at Hyde Park London: Drake. Some late night services will be strengthened to accommodate additional passengers.

Amersham - London Marylebone:
 

No trains between Amersham and London Marylebone.

No direct trains to/from Aylesbury Vale Parkway and London Marylebone.

Revised train times in both directions between Aylesbury Vale Parkway and Amersham.

Travelling to London Marylebone:

• From Aylesbury Vale Parkway, Aylesbury, Stoke Mandeville, Wendover and Great Missenden: Chiltern Railways services to Amersham, for bus replacement services to Beaconsfield, where Chiltern Railways services will continue.

From Amersham, Chalfont & Latimer, Chorleywood, Rickmansworth and Harrow-on-the-Hill: London Underground replacement bus
or train services.

Oyster Pay As You Go users must validate their card at Amersham and London Marylebone as part of the bus replacement service.

Oxford - Islip - Bicester Town line:
 

Normal service. No planned alterations.