Hi Vin Daloo & all,
I have brought this matter up before on this site but as happens frequently here, No one took any notice of my reports that suppliers to the BIR trade in my area stock these mega bottles of tom ketchup, mint sauce and english mustard alongside the patak's sauces.
Someone actually posted words to the effect of "so they have bottles of tomato ketchup in a restaurant, so what".
Having said that, if you find the tomato puree in tins (sold in small tins in some large supermarkets and in large tins in asian stores) it is very different and cooks into the oil much quicker than the tube double concentrate stuff.
As usual, I hope this HELPS,
cheers all,
Blondie