How To Lock Your Bike

I've seen this bike locked up regularly at Tottenham Hale station and locked well; two good locks round both rims, the frame and the saddle.
Sadly, it looked like this today.
[white mtb wit two d-locks]

This is a semi-fail, because both of the locks (which seem good) are only placed around the thinner segments of the railing. These are pretty easy to break/cut.