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As you may be aware London Overground services will start running on the South London Line this Sunday. Click HERE for a timetable of the first few trains from Clapham Junction and Highbury & Islington respectively.
It is worth remembering that Shoreditch High Street is in Zone 1 and so your ticket for a Highbury & Islington via Surrey Quays to Clapham Junction do need to include Zone 1.