Inter-available Routes – National Rail tickets valid on LU/DLR services
Subject to tickets being valid between the appropriate stations or for the zones shown, National Rail singles, returns and Season Tickets are valid on LU /DLR services as shown below:
...
National Rail tickets which include validity:
between West Hampstead Thameslink OR Kentish Town and London Thameslink Group stations (London St Pancras Intl, Farringdon, City Thameslink, London Blackfriars, London Bridge, Elephant & Castle),
are also valid on LU / DLR services:
between West Hampstead / Kentish Town and Kings Cross-St Pancras Und / Farringdon / Blackfriars / London Bridge / Elephant & Castle via any reasonable route but NOT intermediately, and also NOT where tickets are routed ‘FIRST CAPITAL CONNECT ONLY’,
‘LDN NOT UNDERGROUND’ or ‘NOT UNDERGROUND’
...