Delays of up to 45 minutes on First Great Western between Oxford and London Paddington due to problem with lineside equipment at Oxford.
First Great Western advise that a normal service is expected to resume by about 3pm. Also affecting Chiltern Railways and CrossCountry.
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Exam season is underway across the country and it can be a stressful time for students and their parents.
Wednesday afternoon's weather for the west of the region
Wednesday afternoon's weather for the east of the region