> At least for a short while, and I do not understand why, bicycle theft was somehow linked to terrorism by London's police.
Counter-Terrorism Patrol Unit.
IME speculation: for security-adjacent personnel, recovery efforts (equipment, fraud, etc.) are a great way to quantify the work you do when you don't otherwise generate revenue. You can't take credit for disrupting events that didn't happen [because you intervened], but nobody can argue with you recovering or clawing back $x in lost/stolen assets.
They were probably tasked with patrolling for misplaced explosives and other drama, but since incident count is low, they were given supplementary tasks (like tagging bikes they come across on patrol) to justify their salary and foster positive PR.