Policies are not like the words and music to pop songs.
They do NOT become the property of the originator.
Once out in the open, they are Public Property.
So, if a sensible one crops up, and any other party, looks at it, runs it past their 'in house expert' and PR department, and discovers it would work, be good for the Country and, hopefully, be popular, then they are free to use it.
And if this policy comes from The Opposition who are calling for it to be implemented, and it is, does this not say that The Government is LISTENING? 
I have been mildly interested in Politics for almost seventy years, and for most of that time there has been a Tory Government.
When we have had a Labour Government it has always, if my memory serves, been AFTER the party has moved from left to Centre, politically.
Hugh Gaitskill, fought against Clause Four and Harold Wilson carried this forward and ignored his left wing.
Jim Callaghan carried on Wilson's policies but wasn't in the same class as a politician and lost his Party to the militant left.
First Kinnock, started to clear out this destructive element, then John Smith put common sense at the top of the agenda, leaving a clear run for Blair to take over the central ground.
With great good luck, the Tory Party then appointed some odd leaders, like Ian Duncan Smith, who were unelectable.
We have had a long running Tory Government, not because the population liked and trusted them, but because Labour had once again let their Loony Left appear to be in charge.
The frightens the 'floating voters'.
Like him or not, Sir Kier is TRYING to move his Party towards The Centre.
Many of his MP's seem not to see the sense in this or perhaps they prefer to be in opposition where they can float their fantasy policies and do no harm.
Meanwhile, people like me look on with wry amusement, and occasional bouts of despair.