By Jessica Frank-Keyes Sir Keir Starmer will pledge to reset Britain’s relationship with Europe, vowing to put a fresh emphasis on border security at the heart of ties with the continent. The Prime Minister will speak to world leaders at the European Political Community (EPC) summit hosted at Blenheim Palace today. Addressing the heads of European Union (EU) institutions, the leaders of NATO, the Council of Europe and the Organisation for Security and Cooperation in Europe (OSCE), Sir Keir will say: “We cannot let the challenges of the recent past define our relationships of the future. “Europ…