Route 11 runs Liverpool Street to Chelsea via St Paul's, Fleet Street, Parliament Square, and Westminster. Upper deck front seats give you amazing views for £1.75 instead of £30+ tourist buses.

Route 15 goes Tower Hill to Paddington via Aldwych and Oxford Circus. Route 24 covers Camden to Westminster via Regent's Park. Daily bus cap is £5.25 vs £35 for those hop-on-hop-off tours that take forever in traffic.