Bangers & Cash: Restoring Classics S05E03 - Robin Reliant and Mamod Steam

This could be the cheapest pair of restorations the Restoring Classics team have done so far! A three-wheeler Reliant Robin is sent to father and son specialists Melvyn and Adam. 
And a second project takes them back to the world of steam when they pick up a Mamod Roller for only a couple of hundred pounds. What's the worst that can happen? Well, other than setting the worktop bench alight?