By way of anonymous comment (thanks, anonymous) the response came:
"Fortress GB, located at Tavistock House, Tavistock Square, partners to ICTS (UK) Ltd, - railway security management specialists who are engaged in several security projects for London Underground."
On the basis that the 'news' can trot out a silhouetted version of Darth Vader with an actors voice to try and indict an alleged bomber, The Antagonist believes an anonymous comment is at least equally as valid, if not considerably more so, and is certainly worth following up especially when the information contained in it is as relevant as this.
That Fortress GB might contract the services of Visor Consultants is entirely understandable and further, that they might be running an exercise based around, "simultaneous bombs going off precisely at the railway stations where it happened", especially given that "several security projects for London Underground" is the nature of Fortress GB's business.
You can also see how they might choose to conduct this operation outside of their offices in Tavistock Square, rather than move 1,000 people to a rehearsal environment. This probably explains the gentlemen in suits standing around, unharmed, in the photos of the aftermath of whatever happened to the bus.
Was the Number 30 bus already on route to Tavistock Square as part of this operation, or was it diverted after the rail authorities had evaluated the damage and deaths caused on the Underground by the power surge?
If anyone has any additional information that might help piece together events of the day in a methodical and logical manner, please feel free to add comments to the relevant post on the blog, or drop The Antagonist a mail at antagonised[at]hotmail.com.