Don't blame the Tube drivers (or teachers) for getting themselves a good deal. Pilots are stunningly bad at acting collectively and in many cases will sell their own mothers for a job, command, overtime, with little thought at the longterm consequences. Well, after 25 years of racing to the gutter, now we can see the consequence, our differentials have disappeared!
More fool US.
ps there are one or two posts from old school contract holders in legacy airlines on this thread, they really need to know that they are the last generation left to get T&c's like that.