Police without Radios

Ive just checked out todays' BBC report on the Jean Charles Case which is going on at present.

Worryingly one of the features of the failings of the met which has come out is that Police Radios dont work on the tube, yet this was a known operational problem following the 1987 Kings Cross Blaze.

Two serious implications come out of this a) police on the tube in another situation, may have to make a decision in future which could have the same outcome as the de menezes case.

B) what about the British Transport Police? I am making an assumption they have radios- if not, how do they communicate and if they are in a problematic situation, what would they do without the support of colleagues on their way?

Perhaps masts for mobile equipment on the tube is not such a bad idea afterall.