Not only were the Consevatives in Government they also signed up for a treaty in 1993 (Maastrict Treaty) that directly lead to the Social Chapter and the treaty of human rights.. it quite clearly states in the Maastrict treaty that there would be a " Common Foreign and Security Policy" ..link is on wikipedia
Maastricht Treaty - Wikipedia, the free encyclopedia
the then Tory rulers willingly signed this treaty.. and now they try to skip on the deal they made