Preheat oven to 220C
Place the lambs breasts skin side down with the smallest side towards you.
Cut out any overly fatty bits (it is a fatty bit of meat but most renders away through long cooking).
Spread the stuffing evenly over the 2 breasts leaving a 1cm cleared boarder for rolling.
Starting at the skinny end roll up the lamb away from you. Secure with kitchen twin in a few places to hold the rolled roast together. Repeat with the remaining lamb breast.
Score the top of the lamb breast roll lightly across the width with a sharp knife. Place in the fridge uncovered for at least an hour and up to 2 days to dry the skin out a little (this helps with crackling)
When ready to roast drizzle with olive oil and sprinkle with sea salt flakes and the sprigs of lemon thyme.
Place in the middle rack of the oven and roast for 30- 40 minutes.
Then turn the temperature down to 150C an roast for 2 – 2 1/2 hours. Remove and allow to rest a little.
For the carrots place in a heat proof dish drizzle with olive oil, sprinkle with lemon thyme, slat and pepper and place in the oven when lamb still has 40 mins to go. If the carrots need additional roasting after lamb (depending on carrot size) ramp up the heat to 220C and roast while the lamb rests.