@keating wrote:
Are there grounds for a reasonable person to object to the change of use if say a planning permission were lodged? if yes then you need planning permission.
thats a bit of an eccentric statement..!
the easiest way to find out if a change of use is required is to find out under what class of development it is (existing and proposed) in the regs.
and on doing so you find that offices for professional services is class 2;
while use as a health center or clinic or the provision of any medical services is Class 8;
therefore you need planning permission for change of use