Is a Lister Diesel worth having?

I stumbled across a light plant that may be able to be purchased very reasonable. It has a Lister Diesel in it that is not running. I remember having light plants in ND in the late 70s with Lister Diesels in them. They started and ran well in winter conditions back then. Are they reasonable to work on and are parts available? Often think a light plant would have some handy uses if I can get I cheap if its worth fixing but don't want to get into one that no parts are available.

Is a Lister Diesel worth having?