Not Fleet Street / Strand! Outside zone 1 I suspect it's rather easier too. For the OP's question - quite often! But a bus is warm and dry. Outside rush hour, it can often be quick - so saves time. I tend to fall over if I walk and play on phone at same time...so bus means I can check work emails etc (or pokemon It's really sensitive to roadworks tho - such as the ones on Moorgate or the Tower Bridge closure etc.