" I fail to see what relevance the unfortunate mis-routing of a B777 onto the grass has to do with BHXs' capability or otherwise of handling A380s"
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Although seems some dodgy steering was the main cause here, interesting that a pilot who frequently flew 737s from BHX and now flies B777s predicted a few months back,that it was only a matter of time before a 777 went off the taxiway onto the grass at BHX.
This he says due to the fact that although the taxiways are of approved standard are on the limits of that and, as narrow in places and tight turns are difficult.
The secondary factor here appears to be that the pilot was given the wrong information by BHX ,allocated a stand and headed towards.Then when they realised it was the wrong stand ,gave him another one which now needed an extremely tight turn to negotiate which he made a mess of.
There is no doubt BHX wll need to improve parts of the taxiway turning areas and widths, but sure this will be done when/if the runway is extended.