The powers of the SP and WA derive from Westminster.
Because of the Doctrine of Parliamentary Sovreignty their powers could be increased,decreased or the SP and WA could be abolished by the UK Parliament.
Howefver, even the Conservatives gave accepted the SP as the 'settled will of the Scottish people', despite being against it before '97, and in reality the powers of the SP and WA are only likely to increase frther.
The UK is a Unitary State. Under Federalism (e.g. the USA, Germany, Australia, Canada) soverignty is given to…