London Overground Mildmay Line Collectable Guide
There are 6 collectables near Gospel Oak (2 fire extinguishers, 2 route maps, 1 defibrillator, and 1 newspaper stand)
Collectable #1: Fire Extinguisher
Collectable #2: Route Map
Collectable #3: Defibrillator
Collectable #4: Newspaper Stand
Collectable #5: Fire Extinguisher
Collectable #6: Route Map