Question:
Which employer did Roger Scruton work for in Apr, 1970?

Context:
 Roger Scruton works for University of Cambridge from Jan, 1969 to Jan, 1971. 
 Roger Scruton works for University of Buckingham from Jan, 2015 to Jan, 2020. 
 Roger Scruton works for Divine Mercy University from Jan, 2005 to Jan, 2008. 
 Roger Scruton works for Boston University from Jan, 1992 to Jan, 1995. 
 Roger Scruton works for University of Oxford from Jan, 2009 to Jan, 2020. 
 Roger Scruton works for University of St Andrews from Jan, 2011 to Jan, 2014. 
 Roger Scruton works for University of London from Jan, 1971 to Jan, 1992.

Answer:
University of Cambridge