https://www.ebay.co.uk/itm/LIVE-STEAM-2-5-GAUGE-SOUTHERN-SR-4-6-2-LOCOMOTIVE-nv/333930315008?hash=item4dbfcc3d00:g:kKUAAOSwrg5gWIgd
It looks as though it's based on a Bonds Pacific. It certainly uses the Bonds castings. That's a pressurised paraffin burner, not meths as the seller states.
John