Rail passengers are being warned not to travel between King's Lynn and London this weekend.

King's Cross station will be closed for major engineering work today and tomorrow.

Great Northern Trains will only be running Lynn and Hitchin.

There will be no trains at all in or out of King's Cross or Moorgate stations, and no Thameslink services between Peterborough or Cambridge and St Pancras station.

Great Northern trains will still be running between King's Lynn, Cambridge and Hitchin. Thameslink services will run between Bedford and Brighton via St Pancras as normal, but Brighton/Horsham to Cambridge/Peterborough services will run only between Brighton/Horsham and London Bridge. Greater Anglia will run an amended service between Cambridge and Liverpool Street, which is likely to be busier than normal.

THose who absolutely must travel are being warned to allow "significantly more time" and will need to use other rail routes, replacement bus services, or a combination of these, all of which will be extremely busy.

Limited replacement bus services will run between:

Peterborough and Hitchin (calling at all stations)

Hitchin and Potters Bar (calling at all stations)

Stevenage and Enfield Chase (calling at all stations)

Potters Bar and Oakwood (via Hadley Wood and Cockfosters)

Hatfield and St Albans

Hitchin and Luton Airport Parkway (via Stevenage)

St Neots and Bedford

Details are set out here.

Ed Akers, Principal Programme Sponsor for Network Rail, said: "This weekend, we are continuing with vital work on the £1.2bn East Coast upgrade, which is the biggest investment into the line in a generation. We are urging passengers to heed the advice not to travel to or from London on the East Coast Main Line this weekend. We know that this is disruptive and we do apologise for this. Unfortunately, it is necessary to enable us to progress on this work, which will improve reliability for passengers."