When travelling southwards along Ballards Lane you see a sign for the Piccadilly Line replacement bus PL5 (presumably for the drivers rather than passengers) directing into the Finchley Central station forecourt, and there is a similar sign at the same junction facing buses coming out of the forecourt. Why would a Piccadilly Line replacement bus be at Finchley Central? TfL's site suggests that the PL5 will call only at New Southgate NR station and at numerous Piccadilly stations.