Double deckers and fireworks

I came to London last night and was persuaded by a group of Labour friends to join them to watch the Crystal Palace fireworks from the Grape and Grain, the pub at the top of Anerley Hill. Apparently, it was going to cost £5 each to get into the park for a top notch view of the display. Why not watch it for free at the top of the hill, from the comfort of the pub courtyard? What a great idea! That was, until we realised that, being on a main bus route, next to a busy junction with too much traffic, double decker buses wreck any possibility of seeing any fireworks. A great money saving idea, not.