Route 24 runs from hampstead heath through camden, past regent's park, down tottenham court road, past trafalgar square, ending in pimlico. Roughly 45 minutes end-to-end and hits more proper landmarks than any hop-on-hop-off tour.

Sit upstairs on the right side from hampstead for views over london. Upper deck front seats past regent's park give you the best street-level perspective of central london.