user: Question: What is the smallest electorate for the Conservative party in South West Devon constituency, with over 2 Conservatives and a name of Plymstock Radford?
Columns: ['Name', 'Labour', 'Conservative', 'Political party', 'Electorate', 'Constituency']
Types: ['text', 'real', 'real', 'text', 'real', 'text']
Sample row: ['Budshead', 2.0, 1.0, 'No overall', 9697.0, 'Devonport']
SQL:

assistant: SELECT MIN("Electorate") FROM "Table" WHERE "Political party" = 'Conservative' AND "Constituency" = 'South West Devon' AND "Conservative" > 2.0 AND "Name" = 'Plymstock Radford';