heard PA announcements reminding people not to use flash when taking
photos of tube trains, implying that non-flash photos are still fine.

There was a guy in Kings X tube barrier line last wed around 18.50 taking
snaps around the top of the escalators and out of nowhere two BTP appeared
and rushed over to him. The conversation that then took place was
considerably longer than any warning about a flash and included notes being
made in notebooks. The guy looked like a tourist, though of course this is
my opinion and he might have been some dangerous terrorist casing the joint
for a future event.

These days it appears nothing is innocent anymore and demands
investigation.

D