"semi-sweet" are regular (dark) chocolate chips in the UK. Don't buy anything special. American chocolate is generally sweeter than British chocolate, so not as good for baking, but chips are generally sold for baking purposes anyway, so Sainsbury's will do the trick.
yup, Angel Delight. But if you're using it as a powder in the mix, it might be safer to go American, i'm not sure how exactly they compare, apart from both.....
