Well that's still what i'm taking away from it after reading it again...
"The chef then explained that in the takeaway they leave the gravy like this(it's quite thick) and then add water to thin when they need it.It should be very thin,like watery soup.However when it hits the hot pan it will thicken.Finally take another pan,add a chef's spoon of oil and add a very finely chopped garlic clove and brown it.Tip this into the gravy(rinse the garlic pan out with a spoon of gravy).This seemed to give the gravy a fantastic smokey like flavour.Simmer the sauce for about half an hour and the oil should begin to rise."
Then
"I only diluted about a third of my gravy(the rest is in the freezer) and added one clove of garlic.I'll have to ask next time but maybe if you dilute the whole 3 kilo's worth of base then you do have to add more garlic,say three or four,I honestly don't know.If you do have to add more than maybe the BIR smell could even be more intense."