Hi fluffy,
The Mulberry stoker is just released and stocks are low at present but its not a boiler stove so may not your situation. Its about 6kw output but would normally insert againest the fireplace and would require a fireback in place. It wont heat any of you back boiler and the back boiler would need to come out and be replaced by a fireback.
To heat 10 rads via the fire I think your looking at Stratford Si40 from arrow, similar model from Charnwood but dont know the name, greenswitch from esse modeled along the lines of the esse 350 but has a boiler but is more expensive than it should be imho, Parkray consort. All these range price wise from E1700-E2400 but giive only a smalll amount of heat to the room 2-3kw on avg so may also have the rad in the room being fed from it too which is usually the case anyway.