Right, ignoring the sh!te in this thread the facts are:
-They aren't legal. (Unless you set up proper HID projectors or reflectors, headlight washers and an autoleveling system of some sort).
-They probably will pass an MOT, especially in Hella Twins (and I can speak from experience here).
-Police generally don't care/notice as long as they don't dazzle oncomming traffic (which aligned properly they won't) and there is this video on them on the internet where someone was testing them out with a Renault Megane with like 8-10K HIDs and it glared loads, obviously you're asking for trouble with something like that.
-4.3K-6K are the general choice. 8K is probably the limit, 10K is pretty blue so it's attention you don't want.
-They aren't difficult to fit, TBF the stock 10A fuse will be fine, although you can use a 5A one if you're anal, I wouldn't. Make sure they are sealed with the rubber caps though, otherwise as time goes on the lense will get dirty.
-VR6-Joe approves of them so they are fine.
-Diamond Hell thinks your a c*nt for running them.