A good friend and keen cyclist suggested I crowd source the solution to a little problem I'm currently having here, as you're such a bunch of helpful peeps so signed up and here I am.
The other day the key snapped down in my Abus d-lock and it's currently marooned attached to my bike at the local railway station.
So far it's proved resistant to both hack saw, bolt cutters and it doesn't look like there's really much way of retrieving the half key lodged in there.
Hiring a portable Angle grinder or trying to pop it off via a car jack would seem to be the best options.
But any further suggestions much appreciated! Currently tearing what little hair I have left out.