That is not a transformer, it is a switch mode power supply which LEDs do not like. A true transformer would probably work, but an LED driver is what you need.
You don't need any of this, it is just the latest fad. Four items all at one place on the ring is not good practice either.
Put the cooker hood socket near the hood or perhaps in an adjacent wall cupboard.
Part P is a building regulation. The 18th edition is a wiring regulation. Neither are qualifications.
Anyone can change a shower. He/she has to do it safely and of course it should be tested and the results tabulated.
There is no requirement for an isolating switch, pull type or otherwise, as...
Electrical heating is 100% efficient however you use it as all the electrical energy gets transferred to heat. But it is expensive, approx 3 times the cost of gas. If you have a dual rate meter it will be cheaper at night, but your standing charge will be higher.
Thousands of examples of bad practice does,'t make it right. Imagine someone, maybe a wife, going up there and deciding it needs a clean, lugging a high power vacuum cleaner up, and plunging the place into darkness with no floor boards there!
Anyway aren't most aerial amplifiers phantom powered...
Putting a 13 amp socket on the lighting circuit is bad practice. Don't do it. Just remove the plug and wire it into a junction box.
Incidentally LEDs don't have a transformer which is an AC device and LEDs need DC. It will be an LED driver or power supply.
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