It looks as though the ingredient list is incomplete. It was provided to me by a regular visitor to the restaurant who has free access to the kitchens. He mentioned that Ali had given him the list, Ali I thought, was the Chef.
I visited the the restaurant yesterday and found out that Ali is infact the owner and that he doesn't know the exact recipe that the chef uses.
So I am back at square one again.
However, I did pick up said chutney and tried to analyse it, which was just as illusive as the recipe. There is definitely what appears to be candied fruit which may be Mango. There is also a presence of spicing which could be anything but a feint hit of heat sits at the back of the throat.
If it weren't for the fact that Ali explained the chef made large batches of this that cook for hours until thick and paste like, I would have opted simply for a mix of Mango Chutney, Pataks Paste, Tomato paste and coconut.
Fortunately, Ali comes across as being quite open and I have struck a bond with him and gained a new customer for my business.

I may just be able to convince him to let me in to watch this being made.
Fingers crossed!