Set a large, deep pan over a medium heat and add 1 tablespoon of oil from the sun-dried tomatoes. Add the garlic and stir-fry for a few seconds, or until it just starts to colour.
Add the sun-dried and tinned tomatoes, stock and sugar and bring to the boil, stirring constantly. Season with salt and freshly ground black pepper, then cover with a lid, reduce the heat and simmer for 10 minutes.
Remove from the heat and, using a hand blender, blend the soup in the pan. Stir in the milk and cream and season with salt and freshly ground black pepper before heating through on the hob.
Serve hot with ½ teaspoon basil pesto swirled on the top of each bowl of soup.