Put a pan of water on to boil.
Peel and chop the potatoes, add to the pan of water.
Dice the onion and add to a deep frying pan / skillet.
Add the mince and break up the mince, keep stirring until it starts browning.
Once the mince is half cooked, add salt and pepper, Worcestershire Sauce and sprinkle the stock cube and cook the mince until it is all cooked.
Preheat oven to 180°C, 400°F, Gas Mark 6
While the mince is cooking, dice the carrot and chop up the pepper.
Add a little water to the mince mixture, now add the carrots and cook until the carrots are cooked through.
Add the peas and cook until they are no longer frozen.
Once the mixture is all cooked, add the pepper, then transfer the mixture into a Pyrex/Casserole dish.
Once the potatoes are soft and fall off a knife, drain the water away, mash the potatoes until you have a smooth mash.
Add the mash to the top of the shepard's Pie and spread so that it is covering the mince.
Cook in the oven until the potatoes start to go crispy.