Apologies for the typos;

Do use two good locks of different types: one a D lock and the other a solid chain lock - try and get gold rated - expensive but not as much as losing your precious bike (for more info go to you tube, type in "two good locks" and watch the Southwark Cyclists video presented by the late Barry Mason).

The Met do now have a specialist bike theft team, so hopefully you took a note of your frame number.