It might be expensive but this place restores them and seems to have Belle stoves as a specialty.
http://osbornerestoration.co.uk/serv...-belle-ranges/
Here is a different make specific for narrow boats and shepherds huts, again maybe to pricey though.
http://www.chandlerydirect.com/chand...nfo_MMR27.html
This place in Blackburn is an Aladdin's cave to explore in the shed and I ended up with a queenie stove for our living van. Give them a call and explain what your looking for as he is very helpful
http://www.rclynch.co.uk/