Engineering specifications : electrical installations in buildings.
Great Britain.Department of the Environment,issuing body.
Great Britain.Her Majesty's Stationery Office.
"This specification supersedes the former MPBW standard specification (M & E) No. 1 publised by HMSO in 1969 ; also amendment No. 1 (April, 1970) and amendemnt No. 2 (October, 1970".