I believe this is an example of LBSC's 'Ayesha'. (http://www.ebay.co.uk/itm/2-5-inch-Gauge-3-Live-Steam-Atlantic-H2-4-4-2-North-Foreland-Solid-Fuel-/162103044464?hash=item25be182970:g:5AoAAOSwvg9XYRIp)
Caveat emptor, as ever!
But is has clearly run and presumably had a sound boiler in the past.
Andy