Edwina's North London Line confusion

I've just watched "Down the Line" on BBC1. The presenter, Edwina Currie, said the North London Line goes from Richmond to Barking in Docklands. Hmm. 0/10 to the writers and/or editors for those errors. The programme showed Edwina travelling down the line with Richard Pout (though the caption had "Pount") and talking about how the line served LBs Hackney and Newham.

Currently trains can't run through Gospel Oak to/from the line to Barking because of the platform construction at Gospel Oak.