A Stuart 504 boiler from eBay. This was the largest of the three Babcock style boilers that Stuart produced. This is complete in itself although missing a burner. The original would have had a burner similar to the 500 and 502, but with two tubular burners. I have ordered a Bix gas burner for this as it gives more control.
The side panels have been painted with what I cam only assume is Hammerite paint. This is thick and uneven and the devil's own job to remove. Having tried cellulose thinners, then Nitromors, I resorted to a power sander. It has taken hours, but I am down to the bare metal. Then it the usual round of etch resist primer, rubbing down, red oxide primer, rubbing down, then the final top coats of satin black.