Tea will be free same as it would anywhere else (dash of milk is 0.5 syns or can use out of your HEa, then however many syns sugar is if you use that)
Hot chocolate with cream, semi skimmed milk - short 9, tall 13, grande 16, venti 20 (could use milk as HEa, knock some syns off)
Hot chocolate with cream, skimmed - short 8, tall 11, grande 14, venti 17
Frappuccino Blended Coffee with Caramel & Whipped Cream - tall 15, grande 19
Frappuccino Blended Coffee, Light Caramel, No whip, Skimmed Milk, - tall 5, grande 6.5
Iced Caffe Latte, Semi Skimmed Milk - tall 5, grande 6.5
Caffe Latte, skimmed - tall 5, grande 6.5, venti 8.5 (to answer opening post, yes you can use it as HEa, depends how much milk they use, I would guess at around 150ml in the 5, which is near enough half of your allowance so would knock 3 syns off, though it might even be more. I would use it as HEa, and syn it by 1.5 or 2, just cover myself)