I have just been to the winter incarnation of the forest on the roof, on the top floor of Selfridges. The entrance is beautiful and Christmassy, with glitterballs and tree branches sprayed silver.
The food is good quality but overpriced (e.g. £14 for a hamburger and another £4 for the chips to go with it). The choice of beers was limited, although there was a good selection of wines.
It was packed on a Monday afternoon as I guess it will be up to Christmas and through the sale season afterwards. The tables are far too close together making it difficult for the customers and the waiters to pass through.
The restaurant is set under a long, narrow awning with a roll down transparent screen to protect you from the elements. It was a sunny day and the sun streamed through into diners’ eyes and the staff had no way of preventing this. It was noticeably chilly as the sun went down. The main view is the roof of Primark across the street.
All in all, I would say the experience was less “Forest on the Roof” and more “Lunch in a lean-to”.
It is certainly not up to Selfridges normally high standards, I can only imagine that this is a venue more suited to the summer.