Heat the oil in a wide non-stick frying pan (the spaghetti should be able to lie flat). Sauté the spring onions for approx. 5 mins. Add the garlic and chilli, fry briefly. Add the broccoli, courgette, spaghetti, lemon zest and half of the basil to the pan. Pour in the stock, bring to the boil, simmer over a medium heat for approx. 8 mins., stirring occasionally. Add the peas and lemon juice, cook for a further 2 mins. until the spaghetti is al dente. Mix in the remainder of the basil, season.