According to Slashdot MI5 wants access to all the Oyster Card travel records. http://yro.slashdot.org/article.pl?sid=08/03/16/1612203&from=rss For those who dont know it is cheaper to travel on London Transport using an Oyster Card (about 50% cheaper), but it records everywhere you join or leave the tube and everywhere you get on a bus.
MI5 want access to 17 million people's travel data - they must think terrorists are very stupid. If you dont want to leave a record you can get Oyster Cards which have no personal information and they can be topped up with cash. Equally, one can just pay cash.
So, what are they really looking for?
I find this very worrying.