So the restoration is almost complete. I've removed rust and sprayed the interior with a heat resistant Matt black enamel. I finished the outside with a black crackle finish which to be honest I'm not happy with. The crackle effect is uneven. The stove has been a battle and despite decoking the vapouriser it stopped working. The air and fuel intakes seemed clear so I water quenched the vapouriser repeatedly after heating to try and clear more carbon. It seems to have worked for now at least.