citybus 1, 5, 5B, 10 all $3.40 per journey. merton to pp by tram for $2 is about 30 mins.
buses are typically doubledeck. minibuses come in green or red roof and carry 16 passengers. green is government they get salary and benefits and operate to a timetable but red is private and they depart usually when the minibus is full for more profit.
minibuses very rarely have stop buttons so you call out where you want to get off. most red minibuses only accept cash, they give change and run 24 hours. buses accept octupus or cash but they dont give change.