§ Mr. Benceasked the Minister of Power what was the book value of collieries closed by the Scottish Board in the period 1947–63.
§ Mr. ErrollThe N.C.B.'s practice is to depreciate collieries according to their expected useful lives, and the residual book value of most closures is therefore negligible. Any losses on development not covered by normal depreciation provisions are met by the industry as a whole from the Board's central obsolescence fund.