Hi Natterjack,
Already done that mate. They sent me an e-mail saying that Aldi, did it as a special, but Asda stores stock it. Not all the Asda stores stock it, but if you ask customer service in a particular store, they will be able to tell you which stores do.
I am thinking of experimenting with a basic base sauce, and probably around 2 litres of oil to start with. I'll let you know what I come up with and whether it turns out well or not. I'm thinking along the same lines as you, that you must be able to take off the oil without any of the base so it will last longer 
ummmmmm.... food for thought here 
Let us know how you get on. I have a feeling you might need to do some filtering through muslin cloth to get all the bits out and stop the oil having a short shelf life.
Hi Natterjack, I'm thinking that it is the base in the oil which isn't separating that is causing the short shelf life.
When I make a roast at the weekend or whenever for that matter, I take the meat out of the dish, leave it to one side and then let the liquid left in the dish to rest, which will allow the oil naturally rise to the surface which I then spoon off and keep for roasting potatoes at a later date as it's the residue I want for the stock for the gravy.
If we now consider a spiced oil, then completely the opposite, I want to let that oil rest and rise to the surface, then spoon off as much as I can without any of the base, giving me a clear oil which is that what I get from the roast.
I'm thinking that a muslin cloth will not separate the oil from the base and still leave it in there to a degree, which will go off, and spoil the oil or shorten it's shelf life if you see what I mean...
I'll probably not get around to doing this much before Xmas, but will give it a go and see what we can achieve

If anyone else has the time to try this before I do, I would be interested with the results
