is it a batchelors packet? campbells do just a tomato and herb pasta n sauce 120g pack that is free!
The three i have mentioned are the only tomato ones i can find online, sorry if no help!
sw website doesn't always have the most up to date info specially with pasta n sauces it would seem! they prob just updated their flavourings, personally i would think it is free but maybe count it as one syn to make extra sure!