We had an enjoyable day at Sio. We had the bottomless prosecco afternoon tea, a good selection of sandwiches, cake, coffee/tea and a smoothie and the prosecco really was bottomless for 2 hours! Great price too! Only issue were the scones were a little dry and we were in the same time as a couple of large parties which meant queuing for limited loo space. Apart from that the staff were friendly, attentive and couldn’t do enough for you and the location was lovely opposite the cardiff bay fountain and the millennium centre. We hope to come back again.