Vesternet is always very helpful. They are an excellent resource.
As far as appliance control in the UK, you can definitely use pocket sockets (just check the specs to make sure it will handle what you’re going to plug into it) or Aeon Labs makes a “heavy duty” in wall micro which can handle higher loads.
But if you don’t mind the aesthetics of the pocket sockets, they’re certainly easier.
I’m not familiar with safety codes in the U.K., but I’d be rather surprised if you’re allowed to hang the micro down into the wall cavity rather than fitting it into the back box, that would be considered a fire hazard in the US. But perhaps. @John_Crighton might know.