Abi, that's mid- to late 19th century or later softwood, so the earlier discussions of planks & muntin walls were somewhat off-beam. 
You've got yourself a reasonable amount of work to do. Do the architraves and skirtings sit on the boards, or is there a layer of plasterboard behind them?
				
			You've got yourself a reasonable amount of work to do. Do the architraves and skirtings sit on the boards, or is there a layer of plasterboard behind them?

 
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