Spicy root vegetable and lentil casserole

This is one of my favourite meals all year round, but particularly in winter! It's basically this recipe from BBC Good Food but with my own tweaks - I don't use oil or yogurt, or serve it with naan - it's a meal in itself. This time I used a delicious Penang curry powder that I got from The Spice Shop near Portobello market. Really tasty but any curry powder, or paste, will do!