Watch this little clip on the BBC website!
http://www.bbc.co.uk/news/uk-26143668 (http://www.bbc.co.uk/news/uk-26143668)
Bit of expert flying to get under the bridge at the railway station.
Presumably the BBC are using drones.
Sorry! This is not a local topic.
Further research on Google answers my question...
http://www.youtube.com/watch?v=Tu0lawDCkU4 (http://www.youtube.com/watch?v=Tu0lawDCkU4)
For a local twist: http://youtu.be/fJFKWe3JmKY