Aye but they have to register them with VOSA, these days.
Something which the stroke of a pen could change.
I repeat my antipathy to the low energy thinking that imagines that "you can't do that because <x>" where <x> is simply an artificial madey-uppy thing than can be changed in a heartbeat. What is most amusing and annoying in turn, is that this sort of non-thinking seems to settle in the minds of the very people who blather on about "sov-ren-tea" and all that bollocks.
Parliament can do anything it wants. So when parliament doesn't do something it's not because of Newtons fourth law. It's because parliament chooses not to do that.
That can't be overstated. Change income tax ? Of course they could. Abolish VAT on something. Of course they can.
Whenever any politicians says "can't" people need to mentally remember that it's "won't". And make their decisions accordingly.