I've been to afternoon tea several times - it's a very relaxing afternoon break. The food is tasty and we always leave full enough not to want to eat anymore for the rest of the day (of course that doesn't stop us).
We always order the grand tea which includes tea sandwiches, scones, pastries, your choice of tea, and a glass of champagne. I always choose chamomile tea, but I think they have about 12-15 different tea blends you can choose from.