Ok here's what I do I also turn oven on at about 220 with my baking tray & a few knobs of butter & a cup or so of water... then I prepare my lamb.. I brush it with oil & sprinkle crazy salt or brown onion gravy over it, I throw my lamb in & turn the oven down to 180, I then start peeling potatoes & pumpkin (also only Butternut) & carrots & an onion or 2 cut a bit & scattered around, after about 30-45 mins I throw my veggies in around the roast & scatter the onions around too every 30 mins I turn my vegies & then after about 2ish hours (depending on size of meat) I remove the meat & cover with foil to let it rest & if I want my tatties crunchier I turn the oven up high for 10 mins whilst meat is resting, I have also stemed other veggies like corn, beans & cauli) then I carve meat 7 serve up veggies & I make Brown onion gravy from Pkt with boiling water & some of the roasted onion pieces & roast juices too, then sevre up vegies & let who ever wants gravy to pout irt on their own meal & dig in!!!!!