Engineering work is taking place between Moorgate and Finsbury Park, closing all lines in / out of Moorgate.
Hertford North and Welwyn Garden City all stations trains will be diverted to run to and from London Kings Cross.
Paper rail tickets will be accepted on London Underground between Kings Cross St Pancras and Moorgate, and on London Bus route 21 between Moorgate and Drayton Park.
Check before you travel:
You can plan your journey using the National Rail Enquiries Journey Planner
You can plan your journey on London Buses / Underground by using the Transport for London Journey Planner