In my humble opinion, one of the best things to come out of England in the last century was the fine Stationary Engines produced by R A Lister. In particular the Lister CS range of single cylinder Diesel units. They have been known to run for thousands of hours without any maintenance other than topping up the fuel!
Below is a fine example of a well restored Lister running what appears to be a ST Type Generating Head, producing 230VAC.
Here at HBP we have 3 Lister CS Engines, 2 x 6/1 units and a 3/1.
Enjoy the video!