In a small bowl, whisk together ¼ cup (2 fl oz/60 ml) each mayonnaise and olive oil, 2 tablespoons white wine vinegar, 2 teaspoons Dijon mustard, and 1 teaspoon Worcestershire sauce. Gently stir in ¼ cup (1 oz/30 g) crumbled blue cheese. Season to taste with salt and pepper.