Preheat the oven to 160 degrees°C / gas mark 4.
Spray some more low calorie cooking spray in the pan, then sauté the onion and carrots until they start to brown.
Cut half of the potatoes into thin slices, then place them on top of the veg, then place the meat on top.
Dissolve the stock cube in the boiling water, then add this to the pan. Cover, and cook in the oven or on a medium heat on the hob for 80 minutes.
After 80 minutes add the stock pot and Worcestershire sauce, then stir to break up the sliced potatoes. This will thicken the Scouse.
Cut the remaining potato into chunks, then add them and stir. You may need to add a little extra water if it looks a little too dry.
Replace the lid and cook for another hour or so, or until the potatoes are cooked and the lamb is tender.
When cooked, check the seasoning and serve.