(something) Line (something) Circus (something) Street
From Kings Cross I got on the Piccadilly Line (should have been the Victoria Line) to Piccadilly Circus (should have been Oxford Circus); I began walking along Regent Street (should have been Oxford Street) until I realised that Hamleys hadn't moved, to my knowledge, so I was in the wrong place yet again.
Arrived at my destination one hour late.