We went for afternoon tea recently and mostly had a lovely experience with a really superb selection of sandwiches, scones and sweets. The rose bud tea I had was delicious and I enjoyed every minute of the food and drink.
Where Prestonfield slightly fell down for us was that we were in the Yellow Room right beside the front door. If it is a sign of how valued you are as a visitor to a house by how far you are allowed in to it, the Yellow Room pretty much seems to be the waiting area and we didn't really feel that welcome. The seats are low and the leather ones not that comfy, and it took a while to warm through from outside cold. We definitely warmed up with the toasty fire going (about 1/2 hour later) but as a first experience in Prestonfield, I wasn't immediately taken with it. I did pop to the ladies to see if I could see anything else of what looks like an amazing building and I think that it could be a wonderful overall experience had you been shown a bit more into the heart of the home.
Ok, I think I sound really picky but I suppose the first impression really does count and mine was only tepid. Having said this, everything really did warm from then on and I would go back to try again.