Lamb souvlaki

Name: Lamb souvlaki
Ingredients: 2 tsp olive oil; 2 tsp finely grated lemon zest; 4 tbs lemon juice; 2 tsp dried oregano; 125 ml (4 fl oz/½ cup) dry white wine; 3 garlic cloves, finely chopped; 2 fresh bay leaves; 1 kg (2 lb 4 oz) boned leg lamb; 250 g (9 oz/1 cup) low-fat plain yoghurt; 2 garlic cloves, crushed, extra olive oil spray; 4 stoneground wholemeal pitta breads, to serve