
Yes, go for the medium, in fact knock off the 5 mins, lamb should be pink. Don't forget to leave it to rest for at about 15/20 mins for the juices to soak back into the meat, it will be so much more tender. During that time you can turn the oven up and give the roasters that have been making do with the top of the oven a real blast, there, can I come to lunch now? :)