That's interesting data, shaun. This thread is re-awakening my desire to nail down an English Toffee Ale once again.
However, I have some doubts about the advice you got from the brewer.
"Scotland has the perfect climate for growing barley for malt. This malt will impart some of the rich toffee and caramel notes that you are picking up"
He's probably talking about the base malt called "Golden Promise", which is very good, and a little sweet, but does not by itself impart toffee flavors (I've used it a couple times).
"I cant tell you exactly how we do it, but you might want to experiment with a small oak cask or some oak chips and see if you get more of a toffee flavour that way; as well as using some crystal malt."
A lot of American beers are being oaked now, and to me, the oak imparts a weird rough, kinda-vanilla-but-not-quite flavor that I definitely don't associate with toffee. Also, 90% of homebrew recipes contain some kind of crystal malt. Heck, a lot of Malt Extract actually has crystal in it (which is why extract recipes are sometimes known for being sticky-sweet), so you won't get toffee from just adding a pound of C40, or else virtually every homebrew would already taste like toffee.
Honestly, to me, it sounds like they are doing some combination of things to get the toffee flavor, and they consider that combo to be a trade secret, so he's not going to come right out and say it.
I guess if you want to try the full combo of what he's suggesting, here's what you could do:
1) Use Scottish Golden Promise as the base malt, or a mini-mash grain.
2) Boil down a good portion the Golden Promise wort to a caramelly reduction (this is a traditional Scottish technique from the era before commercially available crystal malt).
3) Don't use any aroma/flavor hops, which might mask the toffee flavor
4) Use some Crystal malt (some advertise as imparting "toffee/caramel" flavor, look for those, CaraStan maybe).
5) Use a small amount of American Oak chips in the secondary. Make sure they are not fresh (ie, boil them for a while, or use them in another batch first), because the fresh chips will impart a stronger/rougher character to the beer.
6) Use a cleaner yeast than the English strains. The Scottish Ale yeast from White Labs is great, as is the Wyeast equivalent. Funky/fruity yeast might hide the toffee.
7) Try adding in some toffee-like refined sugars into the boil. Lyles Golden Syrup, or Indian Jaggery sugar, for example. Just NOT real toffee (or anything else w/ oil/fat in the ingredients)