There are ten buses per hour.

Six are double decker buses calling at ALL stations including Crystal Palace except Penge West and additionally call at Selhurst.

Four are single decker buses which call at all stations between New Cross Gate and Crystal Palace.

In theory, there should be a bus every 5 mins from FH and HOP. Overground trains start from New Cross Gate, so is worth getting one, even if it goes to NXG.

Personally, if you're going to Victoria this weekend, get the 185 bus instead.