Oh, that really sucks. Sorry to hear this.
Just for everyone's information, what security did you have?
Also, what part of London, as I suspect some areas are significantly worse than others.
I've recently bought a 650 Ninja as a runabout. Way back (well, 3+ years ago), when I bought my MT-07, I did a back-to-back road test with an ER6, and at that time there was no comparison - the Yamaha was miles ahead, the Kawasaki felt rather agricultural. But I'd say that now Kawasaki have caught up, and in a back-to-back test between a MT-07 Tracer and the Ninja (I was after some weather protection this time) the Kawasaki won out. The £99 down and 3 years 0% did help with the decision, too!