I lived on Underhill, near Belvoir road, for 4 years and only moved away 6 months ago. The P13 was always very good at sticking to schedule. There are also lots of apps showing bus stop arrivals so you can time it and aren't waiting around at the stop for ages. Otherwise you can go through that passageway at the end of Langton rise and walk down Overhill to get to the bus stop with 176, 185 and 197. There are lots of options for the commute, depending on where you need to get to. I travel to Farringdon - P13 to West Dulwich and the one direct train was the most pleasant (generally get a seat on the 0849) and fastest option. But if I needed to get in early (before 8.30am) the P13 can be too full to get on as it goes past a lot of schools. 63 all the way takes longer but you'd get a seat and save a fortune on the travelcard.