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Thanks enfable but we do not have an asbda, waitrose or morrisons near us, and as I said in the question our Sainsburys rarely have it in stock, despite it being on their website.
Thanks heathfield, i guess that makes sense but on the occassions that Sainsburys have hd it on their shelves there are only one or two left, yet all the other sauces are still sat there!
Thanks Gormless, last time we were in Sainsburys we bought four! Our local corner shop sells the paste so I will stock up on that in future, thanks for the tip!