Multiple Oxfordshire bus services to Heathrow airport have been hit by a road closure.

The Oxford Bus Company said in a statement on Tuesday that the airline service would be delayed due to a closure on the M25.

A spokesperson for the company said: "Due to the closure of the M25 between junctions 15 and 14, our Airline services are diverting.

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"As a result, we expect significant delays and advise passengers willing to travel today to allow more time where possible.

"We apologise for any inconvenience caused."

The Oxford Bus Company maintains it is still the most reliable service to and from Heathrow, despite six cancelled services in the last week. 

A spokesman for the company said earlier this week that the number of cancellations was not unusual but that the service was still a top performer for customers. 

He added: "The Airline service is incredibly reliable and we are proud to transport thousands of people safely and promptly to and from Heathrow Airport and Gatwick Airport daily.