I reckon it'll get thrown out.
Usually when MPs try to pass a drug law it was because all the newspapers were going
"Boooooooo! Legal drugs, my friends uncles brother's sister's mother's friend twice removed died that way!
So madam CuntNipple (Theresa May or whatever her name really is, I find CuntNipple fits better) comes up with a downright silly law that is opposed by about anyone who has done History in school.
Then all the papers go
Booooooo! Oppressive law that stops us from researching this, this and that while not getting to the root of the problem
So all the MPs who are officially clueless are simply led by the nose by the papers. If this does get passed I pity the person who has to write in the tens, if not hundreds of thousands of substances (I'm pretty sure a rollercoaster, in it's most basic form qualifies as a substance and with that smiler accident at Alton Towers just shows that the engineers in control of it don't care about user safety, they just want to get them high), personally I think it'll keep getting 'pushed back' so headshops and online headshops can't buy in any large amounts and the UK government will try to force China to make laws forbidding them to sell NPS to the UK while this keeps getting pushed back a month. However wherever there is a want and it isn't fulfilled it creates a vacuum. India will most likely take over this vacuum and if they somehow do manage to ban NPS I can see the people working on LSD analogues (because they will have the knowledge to make LSD) flooding the market with acid so potent tabs are like £2.50 again.
With helicopters and drones on the rise I can see a drop in potent strains of weed (except for places using proper heat ventilation) and the people who previously had grow rooms in the attic now having tub after tub of
P.Cubensis growing in multiple semi-automated monotubs.
Personally, those who know how to grow mushrooms (once people start getting helibusted and dronebusted) going around old grow rooms, setting everything up and teaching people how to grow oyster mushrooms with the equipment they have there, what the person who has just had his mushroom grow room installed for about 2x the price of doing it him/herself does with it after a successful oyster mushroom grow isn't the problem of the 'tutor'.
The thing that has kept mankind alive all these years is our ability to adapt. MPs don't think that applies to drug users however drug users are some of the most resourceful people I've ever met (for example I needed fire to dose my taper of flubro by dissolving it down in PG, there wasn't a lighter in sight, the grill has a grille protecting the elements in it and due to my mother's silliness she set the grill on fire once knocking out the electrics in the gas cooker, meaning the gas has to be lit by a lighter, rather than a button. So I did the only thing I could think of, grabbed a candle, put it in a long glass, soaked the wick in methylated spirit and used a flint and steel to light it, voila I could heat the f-lam to a point where it dissolved and then put it up nature's back pocket

) but from poppy pods to legal highs delivered by your postman to the darknet, drug users are leaps and bounds ahead of the people who want to stop them. It's usually just the young and inexperienced ones who get caught and have their lives ruined.
Personally T May should be tried in the EU court of human rights for trying to ban freedom of expression (and if we can get a religion up) religious freedom.