At the heart of the doctrine of the Trinity is the notion of perichoresis — the interpenetration of each part by each other, so that the whole is greater than the sum of its parts. The diversity of the Trinity is also its unity and its strength; it gains from the different characters and functions of its members. So it is with the UK, and with that much maligned sense of Britishness that speaks to so many beyond our shores of openness, tolerance and ethnic, religious and cultural diversity.