In the eighties, to avoid the double fusing problem with an FCU feeding an appliance, some sparks used to fit 15A sockets on the end of the FCUs and 15A plugs on the appliances.
Others used to fit a flex outlet below with a length of 1.5 attached, The appliance flex would then be jointed to this with a two-part 13A connector.
Having tried all sorts of methods over the decades, I settled on putting an FCU above a worktop, then running the load side to a 13A socket surface-mounted in a concealed (but accessible) location.
This way, there is no fumbling around to disconnect and although there are two fuses, both are easy enough to access.
The main advantage is there is no need to chop off the appliance plugs.
I had such a job inspected by an ECA inspector who passed it as compliant with no qualms.
Edited for clarity.