The main question would be is why are you locking a De Rosa outside a tube station on a bicycle rack?
Not having a dig at you, just that De Rosa (or any high end bicycle) isn't something I can locked up outside a tube station.
If you still insist on locking your De Rosa, have a butcher at Pitlock (can be purchase via Hubjub), they're secured skewer that required special keys to open it, which the theft won't have;
The main question would be is why are you locking a De Rosa outside a tube station on a bicycle rack?
Not having a dig at you, just that De Rosa (or any high end bicycle) isn't something I can locked up outside a tube station.
If you still insist on locking your De Rosa, have a butcher at Pitlock (can be purchase via Hubjub), they're secured skewer that required special keys to open it, which the theft won't have;
(red is area you can pitlock).