Ian Ringrose wrote:
But witch is the largest risk?

a) travelling in a tube train with a failed radio system

b) having to drive to work, due to the tube train not running

You missed the most important one:

c) being stuck in a tube tunnel with people panicking on the train. This
because the only personel on board had a heart attack and nobody knows
about it, noone can give any information etc...

Like "sorry folks, you're on your own because we don't know what's going
on down there".