Cheesy prawn pasta with vegetables

Serves 2. 

6 oz pasta of your choice
1 tbsp olive oil
1 onion roughly chopped 
1 clove garlic chopped finely 
300ml evaporated milk
1 tbsp flour
1 tsp English mustard
1 tsp thyme 
Handful of broccoli florets 
I small diced red pepper
1 handful of mange tout sliced into inch sized pieces 
100g cooked king prawns
Handful of grated cheddar cheese 

1) bring a large pan of water to the boil and add the pasta and the broccoli florets and cook for 10-12 mins until the pasta is al dente. 
2) whilst the pasta is cooking, heat the oil in a large pan and gently fry the onion and garlic until softened. 
3) remove from the heat and stir in the flour with a small amount of the milk and mustard to form a paste. Return to a low heat and stir in the milk in small amounts stirring constantly to make sure there are no lumps. 
4) when all of the milk has been added, add the thyme and stir well, bring to a simmer and add the red pepper and mange tout. 
5) simmer gently for 5 mins, then just before serving add the prawns and cheese, stir until the cheese has melted and the prawns warmed through. 
6) drain the pasta well, divide into bowls and top with the cheesy sauce.