Smoked salmon crêpes

Name: Smoked salmon crêpes
Ingredients: 60g/2¼oz plain flour; 1 large free-range egg; 150ml/5½fl oz milk; 1 tbsp sunflower oil, for frying; 100g/3½oz Greek-style yoghurt; 2 tbsp finely chopped fresh dill, plus extra to garnish; 1 small lemon, 2 tsp juice and 4 wedges only; 100g/3½oz thickly sliced smoked salmon; salt and freshly ground black pepper