I would have thought that the problems on the Jubillee Line were less to do with incompetent engineers, rather it is due to putting construction of the JLE out to the lowest bidder. You get what you pay for. I undertsand that the JLE has quite a few design problems making maintenance difficult. Engineers would never have built such a poor system without the undue influence of politicians and accountants.

When maintenance of the Central Line was taken in-house around 2000 it began to work properly despite issues surrounding the trains, proving LU engineers are better than contractors' engineers.