I used to live in Red Post Hill. The bus noise isn't that noticeable during the day when you're active around the house, but at night, even through double glazing, the rumble of the bus is noticeable. One of the neighbours that I got to know had investigated getting triple glazing, but apparently its really difficult to block out noise from buses because of the low frequency or something like that. That was back when there was only the P4 and 37 running, and from the OP's post it looks like there's now also the 42. With London's population growing and tube & train capacity being squeezed, I won't be surprised if the solution is to add more bus routes everywhere and increase the frequency. It is always easier to add additional buses on a road that already has buses, than get permission to create a new route through streets that don't have buses at the moment. The house next to where I used to live on Red Post Hill sold for over ?1.5m recently - I can't imagine why someone would pay ?1.5m to live on a street with three buses (and one of them a night bus) trundling down it daily!