Instead of going out to high tea, we decided to set up a nice little area for high tea and have High Tea on the Coast to deliver the stuff.
On the day, Alex dropped off all the necessary things for a high tea party - fancy cups and saucers, beautifully set up plates and cake stands - and of course, really delicious food. We had the delux high tea and I ordered a 6 person event - but we had enough food to probably feed 10!
When everything has been dropped off, we were left to have our party without hassle, and they later returned to pick up everything.
One small downside was that because items pick up time was a lot later than when we finished, we still had to help rinse the cups and plates (just in case ants get to them) and stack them somewhere in the garden hoping they won't break in the meantime, for them to come pick it up.
However, with better organisation, I'd definitely use them next time I feel like having a small event at home.

Approximate cost: $55 per person