There are cancellations and extreme delays on Great Northern train journeys between Stevenage and London this morning while emergency services deal with an incident on the line at Woolmer Green.

Great Northern said there are cancellations and delays of up to an hour on journeys between Stevenage and London King’s Cross via Hatfield, and that some services will be diverted via Hertford North.

British Transport Police are yet to confirm to the Comet the nature of the incident.