Question:
Which position did James Prior, Baron Prior hold in Mar, 1980?

Context:
 James Prior, Baron Prior holds the position of Minister of Agriculture, Fisheries and Food from Jun, 1970 to Nov, 1972. 
 James Prior, Baron Prior holds the position of Member of the 47th Parliament of the United Kingdom from Oct, 1974 to Apr, 1979. 
 James Prior, Baron Prior holds the position of Secretary of State for Employment from May, 1979 to Sep, 1981. 
 James Prior, Baron Prior holds the position of Member of the 44th Parliament of the United Kingdom from Mar, 1966 to May, 1970. 
 James Prior, Baron Prior holds the position of Shadow Secretary of State for Employment from Oct, 1974 to May, 1979. 
 James Prior, Baron Prior holds the position of Shadow Leader of the House of Commons from Mar, 1974 to Oct, 1974. 
 James Prior, Baron Prior holds the position of Member of the 45th Parliament of the United Kingdom from Jun, 1970 to Feb, 1974. 
 James Prior, Baron Prior holds the position of Member of the 43rd Parliament of the United Kingdom from Oct, 1964 to Mar, 1966. 
 James Prior, Baron Prior holds the position of Member of the 49th Parliament of the United Kingdom from Jun, 1983 to May, 1987. 
 James Prior, Baron Prior holds the position of Member of the 46th Parliament of the United Kingdom from Feb, 1974 to Sep, 1974. 
 James Prior, Baron Prior holds the position of Shadow Home Secretary from Mar, 1974 to Jun, 1974. 
 James Prior, Baron Prior holds the position of Member of the 48th Parliament of the United Kingdom from May, 1979 to May, 1983. 
 James Prior, Baron Prior holds the position of Member of the 42nd Parliament of the United Kingdom from Oct, 1959 to Sep, 1964. 
 James Prior, Baron Prior holds the position of Secretary of State for Northern Ireland from Sep, 1981 to Sep, 1984. 
 James Prior, Baron Prior holds the position of Member of the House of Lords from Oct, 1987 to Dec, 2016. 
 James Prior, Baron Prior holds the position of Leader of the House of Commons from Nov, 1972 to Mar, 1974.

Answer:
Member of the 48th Parliament of the United Kingdom