Bike thieves in London.

Ever had a bike stolen? I did multiple times since when I spend 4 days a week in the city.
Last time that it happened, I spoke to two policemen that were in the area, they told that there is an always increasing number of bike stolen.
Looking at the internet, it seems that stealing bikes is a growing phenomenon worldwide.
I've found this interesting video on youtube, it's about bike thieves in London downtown.
Have a look:

Those gps trackers are pretty cool and they seem to be quite effective.