Be aware! Very determined thieves recently stole bikes from the underground car park below Eton Riverside.
The owners had all of the recommended security in place. The burglars cut a D lock and other string security cables, which can only be done with specialist cutters.
If you think your bike is safe; note the lengths criminals will go to. Make sure your bikes are locked, take photos of them and their frame/serial numbers and consider multiple locks/chains and CCTV systems.