I don't think it's necessary for a standard 16A skt to be switched unless it's on a construction site but maybe one of the other guys know for sure.

7.4 Construction and demolition site installations

7.4.6.7 The distribution board shall contain
a)
b)
c)
d) switched socket-outlets (16 A), connected in pairs to individual singlepole
20 A combined circuit-breakers and 30 mA earth leakage protection
of sufficient number.