This was great! My dh, who doesn't really like lamb, liked this. I did add some sliced, cooked carrots (to make it a one dish meal) so doubled the broth, flour, mustard, worcestershire to make enough extra sauce. I will definitely make again, whenever I can get my hands on some lamb! Thanks!
Not really sure how the lamb makes this Australian (what else would you make a SHEPHERD's pie with?) but it is a great recipe just the same. The layer of corn between the meat and potato is genius.