A cup of tea won't cause a hypo. Nor will a cup of tea with 50-100ml of either skimmed or semi skimmed milk prevent a hypo. 100ml of semi skimmed milk has 4.8g of carbs. 100ml of skimmed milk has 5g of carbs (so realistically, there is no difference in the milks). Having a hypo after a cup of tea is just a coincidence, or perhaps you are having tea at a similar time every day and that time is when your body is going to have a hypo. We're these hypos confirmed by finger prick tests? How is your type 2 treated, if medication is causing daily hypos you may need to discuss reducing your medication with your DSN.