It seems that it is all three, then:
"Emergency engineering works are taking place near Peterborough.
Because of this, trains between Peterborough and Grantham are being delayed by up to 100 minutes. These delays will continue until further notice.
In addition, the following services are trapped behind a broken down freight train and are expected to be around 2 hours late:
14:30 London Kings Cross - Newcastle
14:25 London Kings Cross - Leeds
13:57 Norwich - Liverpool Lime Street
14:48 London Kings Cross - Bradford Interchange.
"
:roll: