I have only had it a couple of times and it's been a while but from memory:
There is roast barley in there I think.
It had some diacetyl, intentionally or not, and I'm pretty sure they would use an english yeast. Wyeast 1968 if you have or S-04.
Guessing the grain bill is pretty simple, maybe:
87% pale
10% crystal
3% roast
Hopping is probably mainly for bittering, 30 IBU's at 60 mins maybe.
Or some thing along those lines.... I'm really just guessing from what I remember:)