My cooker circuit has been turned into a switched radial
circuit by fitting 3 socket outlets in place of the
original hardwired cooker outlet.

Provided the MCB/fuse is of a sensible rating, of course. (i.e. a 32A or 20A
B curve). This will usually be the case, although frequently cooker circuits
are wired with higher ratings, such as 40A or 45A, which would need swapping
out. Also, you'll need to prove that the sockets aren't likely to be used
for outdoor portable equipment, as they would need an RCD/RCBO.

Christian.