Tracker from ebay Alarm with immobilizer Disc lock on front (and rear if it has a disc) Little trick with the rear disc models - Use the yellow bungee cord thing on the front disc lock, everyone notices that it's there. BUT....on the rear disc do not use the bungee cord. It hides the disc lock effectively, people don't look for it because they don't see the cord. Big fuck off Oxford chain and lock, wrapped around any stationary concreted in thing you can get close to.
Steve had it in one - never leave your ped on a London street without locking it to something,else they'll just come along in a van and 1 stop shop one either end and off.!