Another potentially related drill.

MPs fail to attend own terrorism drill
“A drill designed to prepare the Commons for a terrorist attack was attended by just five per cent of MPs…”
(source)

No Interest in Terror Drill
“…About 30 of the 646 members of the house participated in the morning exercise…”
(source)

Although this drill did not function as operational cover for another event, there still may be a relation to 7/7.

The obvious question is, did a low percentage of MPs attend the excercise due to the fact that the 7/7 attack was carried out in synchronization with the Visor drills? Where they afraid of a repeat? Or is this percentage attendance consistent with turn out at previous drills?

also see: 7/7 potentially related terror drills

-Culhavoc