Glasgow's new Riverside Museum have invited George and Jim Telford,  twin great-grandsons of the famous Thomas Telford,  to expound to each and every visitor the delights of engineering whether they like it or not. But beware, they have enthusiasm to spare. They know (or at least can guess) the inner workings and engineering capabilities of every mechanical device within Britain, so long as it doesn’t involve ‘electric’ – which they despise. If it can’t move by cogs, axle grease or steam it is beneath contempt and destined for failure.

Their mood swings are legendary, sweeping from genuine irrepressible delight at the sight of a well lubricated piston, to deep depression and melancholy at the mention of a microchip. Finishing each others sentences, and frequently bickering as twins are wont to do, George and Jim will probably bluster their way through a crowd to examine any and every device that features engineering, from the humble ballpoint pen, to the hydraulic rudder grommets of the diesel powered launch.