The BBC's documentary on the construction of Crossrail — The Fifteen Billion Pound Railway — was a televisual highlight when it aired in 2014. (The Telegraph gave it a measly three out of five, but then what do they know.) Never before had we been treated to such behind-the-scenes eye candy: repairing a tunnel under the Thames; threading tunnels in between other tunnels... we were in tunnel heaven.
Now the show's back with a second series, and as the ramped-up trailer hints — the clock is ticking and the heat is on. As the Queen herself gives the line its controversial new name, there's still much work to be done before the trains arrive, including all those annoying niggles no one thought about. Case in point, ancient fault lines beneath Farringdon that threaten the site with flooding...
The Fifteen Billion Pound Railway airs on BBC Two from 22 May, and will be available on BBC iPlayer catch-up.
