I just loved the lancashire cheese idea - I just can't find any around here anymore. I had to use aged white cheddar instead (not the same I know, but I couldn't help it). I used mushroom stock in place of the beef stock - which I thought worked well. I found that the recipe served more than 4, so I have frozen the other portions. Hopefully they will be as good as the original. Thanks for posting.
The best recipe for Shepherds pie that i have made. Excellent!