Most dance teachers and students will take the day off tomorrow but Danceworks and Pineapple will be open.
You will find Danceworks's schedule here and Pineapple's here.
If you are a beginner or, like me, a show learner, I can strongly recommend Adam Pudney's class at Danceworks between 16:00 and 17:30. He has high standards and although he also has abundant patience he will expect the best from you and squeeze it out of you. I have taken two of his classes (see Pineapple 20 Nov 2013 and Another Slice of Pineapple 12 July 2015) and enjoyed them both tremendously.
If you go to either studio you will need to buy at least temporary membership which entitles you to enter the building and then pay the instructor for his or her class. Fees vary but most seem to be about £8.