Roast Lamb - I just love it! It's not massively popular in Malta (the local "haruf" available only for a very short time at the start of spring, the rest all imported), however it is an institution both in Australia and where i'm living now, UK (Sussex). All of England, 50% of the total land in fact is used for pasture here in the UK, meaning that by far, the sheep and cow industry is the one that takes up the most space here. I've seen sheep in the most unlikely places, right on top of Wales' tallest mountain, down the road from our house, randomly walking down the road with some ponies through country lanes. This land is full of sheep!
In a separate tiny bowl, mix 1 rounded teaspoon of cornflour with a bit of cold water to make a smooth liquidy paste. Pour this in to the gravy, whisking as you pour it in. Bring back to a simmer and stir until it's reduced and thick enough. season to taste :) You should have a lovely dark brown strongly lamb flavoured gravy :)