Tubeworker is still trying to get our head round the idea that while the country as a whole has a security level of 'critical', ours is a mere 'serious' (one step less serious than 'critical'). What, is London Underground some kind of place of safety, a refuge from the unsafe streets?!
Management say that there is 'no specific threat' to the Tube, but since it is less than two years since over 50 people were killed by suicide bombers, and given that Al Qaeda and similar groups are not usually inclined to give warnings, we wouldn't have thought a 'specific threat' would be necessary.
A year after the bombings, LUL had failed to learn the lessons, and a later on from then, it is still not clear that they have.
Probably the most important factor in maintaining security is keeping up staffing levels. But since the 7/7 bombs, London Underground has cut station staffing under the pretext of the 35-hour week. Its first steps to providing the 'reassurance' of security it is keen to give people would be to reverse those cuts and to abandon its plans for further staffing cuts.
LUL has a better idea, though - make those staff who remain wear hi-vis.