Google UK hydroponic stores. There are dozens.
As to that link above for the NFT kit, i could most certainly be wrong in my thoughts but i am considering it as spam advertising. On the 17th of this month he is linking to it praising it saying it is a 10/10 piece of kit, in order to give a rating he would have to have used it and understand the difference between a bad kit and a good one, and yet on the 18th of the month, he is also linking to it but asking for peoples opinions on the kit and also for options, as if he'd yet to buy it. Maybe it's good, maybe it's not, but i don't trust the user as an impartial reviewer, sorry.