FCU is better than a plug for sure. But when on for sustained periods the 13A fuse, or connections, can overheat. A small box with a 13A MCB (or 16A - yes you can have a 16A MCB off a ring) and 20A DP switch off the ring would be better for sure. They could be in an adjacent cupboard.
An...
Many manufacturers do not rewrite the instruction for the UK market. For example AEG make an integrated fridge that consumes about 1/3 amp. They say it must have a 16A supply. That is totally inappropriate for British ring final circuits. So it must be ignored.
It comes with a 13A plug with a...
Because it works 24/7/365, drawing a fair bit of amps. Sockets were not intended or designed for such permanent use. No one would wire a 3kW immersion on a 13A socket. I have seen large fridge sockets get brown with heat.
A ring serving only heavy appliances may be the better solution. And a cheaper solution if say using AFDDs. Then only one needs to be used.
Three radials say with expensive AFDDs or RCBO's, can be quite expensive for no to little gain over a ring.
Sockets are not for permanently used appliances. They are to be plugged in and out. Permanently wired in appliance need to be hard wired. And that in theory includes a 24/7/365 fridge.
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