For anyone looking for UK groceries:
I was very pleasantly surprised the last time I went to the Indian grocery on Walnut bet. 42nd & 43rd. Apart from the usual array of subcontinental stuff, they had PG Tips tea, HP sauce, Jaffa cakes and a cereal that looked suspiciously Weetabixy... All at fair prices too.
Try the homemade samosas over there as well.