I was looking for a mazac flywheeld flatbase SE1 for quite a while already when this one came up for sale by Tom/Reckless_Engineer on the Mamod forum. I didn't have to think about it for a long time, because the £ 50 he wanted for is was very reasonable.
Th engine looked lik this when I got it:
The engine was restored, and in a very proper way I must say! the only thing I was not satisfied with was the boiler, I wanted it to be a bit more shiny. After sanding it down with some wet & dry paper and a Brasso treatment, it now looks like this: