My verdict, pleasant enough tasting but doesn't taste of anything in particular unlike the real base sauce I have here; but the garlic gives it a bit of body.
Despite volunteering in a local restaurant kitchen for the last few months and pestering at every opportunity I never got a proper recipe for the gravy - starters, naans, rice, pre-cook, mains - all yes, but no definitive gravy recipe, just a list of ingredients (although I'm not convinced that they are the whole story!). That's how important the gravy is - replicate that and I can do the rest, the Glasgow Takeaway book gets close, but it's too sweet and sickly, which I've covered on other posts on the subject.