In reply to Dan Arkle:
If they actually get you high, then they're illegal under the Psychoactive Substances Act. Looking at the ingredients, they ain't gonna get you high. Those herbs have got some possibly-almost-active compounds, but compared to alcohol or actual GABAergic drugs like benzos or z-drugs, they don't do anything.
There are still a few grey-market herbs that do get you high available such as Kratom, Kanna, Kava - these are technically illegal since they do get you high and therefore they the have risk of overdose, dependence, etc. No one's going to put them in a flashy bottle with an expensive marketing campaign!
I remember when Nutt (my hero) was trying to come up with an actual alcohol substitute drug that would make you a bit intoxicated and have an antidote - it was this drug:
https://en.wikipedia.org/wiki/MEAI
Since it got in the media, it was briefly available on the legal highs market (which was in full swing at the time). I tried it, and sadly, it was shit. Nice idea though, he obviously gave up and went for this very tame, very safe, and basically inactive version instead, and picked up the cheque at the end of it.