Since Apple CEO Tim Cook has been visiting China, this report emanating from China appears credible, although in the world of Apple rumors there is never a certainty.

FORBES: $99 iPhone Rumor Quashed On China TV, Good For Apple

Project Zero employs a field energy adviser, Charlie, charged with visiting homes and producing a free energy report for the occupants.

FORBES: Project Zero: A Roadmap For Local Energy Security And Carbon Neutrality In Southern Denmark

Mr MacAskill was visiting HMP Barlinnie in Glasgow after an HMIP report, published last week, described it as "grossly overcrowded".

BBC: Prison overcrowding 'needs to be fixed', MacAskill says