Major changes

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

Hard Rock Calling at Hyde Park London - The following additional late night trains will run from Marylebone:

• 2257 service from Marylebone calling at, Gerrards Cross 2316, Beaconsfield 2322, High Wycombe 2328, Princes Risborough 2338 and Aylesbury 2357.
• 2357 service from Marylebone calling at, Gerrards Cross 0015, Beaconsfield 0021, High Wycombe 0027, Princes Risborough 0036 and Aylesbury 0056.

Amersham - London Marylebone:
 

No trains between Amersham and London Marylebone.

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

A bus replacement service will run between Aylesbury Vale Parkway and Aylesbury.

Revised train times in both directions between Aylesbury and Amersham.

Travelling to London Marylebone:

• From Aylesbury Vale Parkway, Aylesbury, Stoke Mandeville, Wendover and Great Missenden: Bus replacement service between Aylesbury Vale Parkway and Aylesbury, for connecting 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.