Hello everyone Sorry if this is in the wrong place. I have been reading conflicting information and getting myself a little confused so hoping someone can help. I am going to be taking a premises that has A4. I have read that I can change to A3 without planning permission. How do you do this? Do I still need to submit an application, notice or just operate as A3? Also, what is the exact difference between A2 and B1? Can you change from A4 to either of these without planning permission? Thank you in advance.