A proposed amendment to the new Psychoactive Substance Bill by the House of Lords attempts to tag every psychoactive substance, even presently illegal drugs, to the bill, so as to permit their possession along with RC's without risk of prosecution!
Go the Lords!
From here - http://www.publications.parliament.uk/pa/bills/lbill/2015-2016/0002/amend/ml002-I.htm
Another proposed amendment seeks to have cannabis entirely removed.
Go the Lords!

After Clause 5
LORD HOWARTH OF NEWPORT
BARONESS MEACHER
39
Insert the following new Clause—
“Possession for personal use
Possession for personal use of any psychoactive substances, including
psychoactive substances hitherto controlled under the provisions of the
Misuse of Drugs Act 1971, is not a criminal offence."
Another proposed amendment seeks to have cannabis entirely removed.
After Clause 10
LORD PADDICK
BARONESS HAMWEE
50
Insert the following new Clause—
“Control of cannabis
(1) Within six months of the passing of this Act, the Secretary of State shall
make regulations to amend the Misuse of Drugs Regulations 2001—
(a) to omit from Schedule 1 to the regulations the substances listed in
subsection (2); and
(b) to add those substances to Schedule 2 to the regulations.
(2)
The substances referred to in subsection (1) are—
(a) cannabis; and
(b) cannabis resin.”