It depends on your route. Grandparent sounds like they are bussing in central London. Further out busses are often the fastest route as all the tube lines are h

It depends on your route. Grandparent sounds like they are bussing in central London. Further out busses are often the fastest route as all the tube lines are headed into the city, but people often want to go in other directions. There are many people further out whose commute is bus then tube as well. Bus stops are 1km apart and the bus might stop for 30 seconds or skip stops entirely.