Preheat the oven to 200oC/400oF/gas mark 6. Roll out the puff pastry into a large rectangle approx. ½ cm thick. With a sharp knife, score a rectangle, about 1 inch in from the outside edge being careful not to cut all the way through. Place on a baking tray.
Bake the pastry in the oven for 10 mins, take out and push the centre down with the back of a spoon leaving the outside edge raised. Spread the Heritage Tomato Relish over the middle of the pastry, cover with the slices of cheese and sprinkle with the olives and thyme.
Bake in the oven for 20 mins or until the pastry is golden and flaky.