I think that’s probably a reference to the fact that if the power goes out (not the Internet) then when the power comes back on the Hue bulbs will come back on as well even if they were off when the power went out. That’s true of most smart lightbulbs. A lot of people don’t care, but some people find it annoying.
Otherwise I don’t know of any situation where hue bulbs “get stuck on.”
Have you had a chance to look at the UK lighting FAQ? It might give you some more ideas.
Also the Hue system offers two battery operated switches which you can put anywhere. They aren’t shaped like conventional UK switches, but they do work well. That gives you a physical switch you can use. We have one of these in the guestroom and guests find it very intuitive.
https://www.amazon.co.uk/Philips-Wireless-Lighting-Dimmer-Switch/dp/B0148NMVX8
If you put the bulbs in a fitting and you want to lock out the existing wall switch, The easiest way is just to get a child safety lock and then put the battery operated device on the wall next to the original switch.
https://www.amazon.co.uk/switches-accidental-switching-allowing-intentional/dp/B06XHXN59W/
But different things work for different people, it’s always good to have choices. 