Below provides a guide on what this will mean for your journey :

• Thursday 24th December 2015 (Christmas Eve) – An amended weekday timetable will be in operation and services close down earlier than normal.
• Friday 25th December 2015 (Christmas Day) – No service.
• Saturday 26th December 2015 (Boxing Day) – Amended service between Oxford Parkway and London Marylebone (calling at the following stations Gerrards Cross, Beaconsfield, High Wycombe, Princes Risborough, Haddenham & Thame and Bicester Village).
• Sunday 27th December 2015 – Amended Sunday service will be in operation. Please note that GWR will also be diverting services on the Chiltern Railways route between London Marylebone and Banbury.
• Monday 28th December 2015 – Amended Sunday service will be in operation. Please note that GWR will also be diverting services on the Chiltern Railways route between London Marylebone and Banbury.
• Tuesday 29th December 2015 – An amended weekday service will be in operation.
• Wednesday 30th December 2015 – An amended weekday service will be in operation.
• Thursday 31st December 2015 – An amended weekday service will be in operation along with additional late night services for New Year’s Eve.
• Friday 1st January 2016 – An amended Sunday service will be in operation.
• Saturday 2nd January 2016 – A normal Saturday service will be in operation.
• Sunday 3rd January 2016 – A reduced Sunday service will be in operation as we will have engineering work taking place between Bicester North and Leamington Spa until midday and between Banbury and Leamington Spa all day. A normal Sunday service will be running on the London to Aylesbury via Amersham line.

The normal timetable will resume on Monday 4th January 2015. Timetables for the amended service dates will be available closer to the time.