Chicken & Broccoli Bake

1 large head of broccoli, divided into florets

2 tbsp olive oil

50g butter

1 leek, diced

2 garlic cloves, crushed

60ml white wine (optional)

25g butter

1 tbsp plain or self-raising flour

½ pint chicken stock

150ml fresh cream

150ml milk

1 bay leaf

Handful of fresh thyme, sage and parsley

Salt and freshly ground black pepper

Sueeze of ½ lemon

1 cooked chicken or 4 cooked chicken breasts, cut into cubes

For the topping

50g melted butter

300g breadcrumbs

200g grated cheddar