GH Best Brown unscented is one I'm never without, alongside Ennerdale and 1792. Easily overlooked because it's "just" tobacco, virginia and burley, and no flavourings. But it's lovely. Tastes like old fashioned tobacconists used to smell. Woody, nutty, toasty and slightly sweet with creamy smoke. And because there are no flavourings or essences at all (and there really aren't - there is nothing floral or "Lakeland" about it) you can mix the leftovers in your pouch or tin to whatever you're opening next and it'll always work. I've smoked it straight after 1792 and you might think it would be bland in comparison, but it's not.
It's a hard working blend that seems to be good in any pipe at any time of day.
Interestingly, it may be one of the few GH flakes that I find improves with a little drying. I almost never dry my flakes and have no difficulty in lighting them or keeping them lit, even the really moist ones like 1792. But I've always bought BBU loose from a high street tobacconist. It's one of their most popular blends so they're in and out of the jar all the time. Lately they say the factory are sending more tinned than loose and I've found it's better to transfer a 2 oz tin to a leather pouch to get it to the same smoking readiness as the loose.
GH Louisiana and Jamaican Rum flakes are really good as well. The Louisiana is probably my preferred of the two but the Jamaican isn't a bad substitute for 1792 in my local tobacconist if they've run out of 1792.