What are the London restrictions for Super Off-Peak and Off-Peak Day Returns?

Since January 2019, Thameslink and Great Nothern introduced a Super Off-Peak Day Return/Travelcard to their weekday ticket range between Peterborough and London Thameslink/London stations. 

Super Off-Peak Day tickets cannot be used on trains that arrive at London stations before 10.55 or that depart London stations between 16.30 and 19.01. 

Off-Peak Day tickets between London King's Cross and Stevenage are valid after 09.29 (Monday to Friday).