The last paragraph of the news article reads:

They added: "When we arrange large scale events the Horniman Museum always directs visitors towards using public transport, while pointing out that there is only limited public parking available in the area surrounding the museum."

This is pretty lame. We all know that if public transport isn't a convenient way of getting to an event and you have access to a car then you will use the car.

The area surrounding the Horniman cannot sustain a large influx of car based visitors and they should not hold events that will inevitably result in a significantly increased number of visitors travelling by car.