There's an off-peak return between Sunderland and Finsbury Park routed Grand Central only; it does have a Maltese cross, so would the expectation be to use the Victoria / Piccadilly line rather than Thameslink / Great Northern?
There's also a 'not via London' fare from Sunderland to Watford (Met), which presumably means via Newcastle, Birmingham, Princes Risborough and Aylesbury; whether or not the ticket would be accepted at the Watford gate line, or if it's possible to buy that ticket, is beyond me. Trying the TfW Rail app for Sunderland – Watford Underground (not via London) doesn't give any results, despite there being, in theory, a difference in price between the not via London and via London fares.
There's also a 'not via London' fare from Sunderland to Watford (Met), which presumably means via Newcastle, Birmingham, Princes Risborough and Aylesbury; whether or not the ticket would be accepted at the Watford gate line, or if it's possible to buy that ticket, is beyond me. Trying the TfW Rail app for Sunderland – Watford Underground (not via London) doesn't give any results, despite there being, in theory, a difference in price between the not via London and via London fares.
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