Hi Davy
http://thefoody.com/basic/lamb.htmlThis explains the basic cuts of lamb.
You can use any cut other than the breast to make a curry it all depends on how you pre-cook it.
Generally I use leg of lamb or shoulder which I bone, cube and remove most of the fat from. I then seal the meat in a frying pan add some seasonong (salt and Pepper) and just cover the meat with water. I then cover and braise in the oven at 160c for around 3 hours until the meat is almost melting in the mouth. I then add to the curry.
For a quicker dish you can use a more expensive cut of lamb. Remove the fat and cube then in hot frying pan being careful not to overcrowd the meat seal it all over. Set to one side and add to the curry at the final stage. The better cuts should still be just pink when you serve to preserve the tenderness.