What is Roy Mason?
{{Infobox Officeholder |honorific-prefix = [[The Right Honourable]] |name = The Lord Mason of Barnsley |honorific-suffix = [[Privy Council of the United Kingdom|PC]] |office = [[Secretary of State for Northern Ireland]] |primeminister = [[James Callaghan]] |term_start = 10 September 1976 |term_end = 4 May 1979 |predecessor = [[Merlyn Rees, Baron Merlyn-Rees|Merlyn Rees]] |successor = [[Humphrey Atkins]] |office2 = [[Secretary of State for Defence]] |primeminister2 = [[Harold Wilson]]<br>[[James Callaghan]] |term_start2 = 4 March 1974 |term_end2 = 10 September 1976 |predecessor2 = [[Ian Gilmour, Baron Gilmour of Craigmillar|Ian Gilmour]] |successor2 = [[Fred Mulley]] |office3 = [[Secretary of State for Business, Innovation and Skills|President of the Board of Trade]] |primeminister3 = [[Harold Wilson]] |term_start3 = 6 October 1969 |term_end3 = 19 June 1970 |predecessor3 = [[Anthony Crosland]] |successor3 = [[Michael Noble, Baron Glenkinglas|Michael Noble]] |office4 = [[Ministry of Power (United Kingdom)|Minister of Power]] |primeminister4 = [[Harold Wilson]] |term_start4 = 1 July 1968 |term_end4 = 6 October 1969 |predecessor4 = [[Ray Gunter]] |successor4 = Office Abolished |office5 = [[Postmaster General of the United Kingdom|Postmaster General]] |primeminister5 = [[Harold Wilson]] |term_start5 = 6 April 1968 |term_end5 = 1 July 1968 |predecessor5 = [[Edward Short, Baron Glenamara|Edward Short]] |successor5 = [[John Stonehouse]] |office6 = [[Member of Parliament (UK)|Member of Parliament]] <br> for [[Barnsley Central (UK Parliament constituency)|Barnsley Central]] |term_start6 = 9 June 1983 |term_end6 = 11 June 1987 |predecessor6 = Constituency Created |successor6 = [[Eric Illsley]] |office7 = [[Member of Parliament (UK)|Member of Parliament]] <br> for [[Barnsley (UK Parliament constituency)|Ba