High tea usually involves something savoury too. It does help with all the other sweet foods. If you want 8 choices, I'd have at least 2 of them as savoury options.
I like to make mini quiches/frittatas (usually vegetarian) and some finger/ribbon sandwiches. Definitely cucumber sandwiches as one option and I whip my butter for that extra touch of luxe. I get requests for my chicken and mayo sandwiches and will usually either make a roast beef and horseraddish, smoked salmon and dill or egg and cress sandwich as well.
And maybe another sweet addition to your list like a friand or chocolate brownie or madeleines. I personally don't think cupcakes are 'high tea-ish' but that's just my opinion.
Then you have something chocolate (brownies), something plain (scones), something citrus-y (cheesecake), something biscuit-y/dry (madeleines/shortbread), something rich (caramel tarts - add some fleur del sel flakes on top to jazz it up), something fanciful (macarons) and something savoury. Anything else is a bonus.