Initially, I was thinking of making an 80/- Scottish Ale from Fawcett's Golden Promise (GP) with a touch of roasted barley. After some research, it appears that Fawcett GP has a diastatic potential (DP) of about 50 lintner, which is about the minimum to self convert. Then I thought I should use some US 2-row (~20-25% of the grain bill) to bump up the DP and hopefully maintain my usual efficiency. [Scots are known for being thrifty so I wouldn't be surprised if they used some high DP malt, perhaps distiller's malt]
Now I'm concerned that I might loose to much of that GP character by having a more efficient mash. Any thoughts on mixing UK & US base malts for UK styles?