I still haven't kicked this brew off but I did try another Proper Job - without cooling it in the fridge this time - and I enjoyed it a lot more. So, since I have a 25Kg sack of MO here, and all the necessary hops, I'll give Gray's Odd Job and a seperate Amarillo brew a go.

Edit: Gray, what oats did you use - are they from a supermarket? Did you mash them with the rest of the grain bill?
Edit2: Scratch that, I found the answer in this thread on the subject:
Thanks again.