Here is what it says on page 260 of the book entitled House of Commons Procedure and Practice :
The duties of the Speaker of the House of Commons require balancing the rights and interests of the majority and minority in the House to ensure that the public business is efficiently transacted and that the interests of all parts of the House are advocated and protected against the use of arbitrary authority.
A little further on, it is even more interesting:
The Speaker is the servant, not of any part of the House or any majority in the House, but of the entire institution and the best interests of the House as distilled over many generations in its practices.
I was present when the government House leader introduced his motion. He said that, ultimately, it would not change much because the Chair was already doing this work. I urge the government not to go any further and to withdraw this motion, because so far the Chair has indeed used its authority wisely.
In a bill such as the one on young offenders, of the 3,000 amendments for which I gave notice, the Speaker still accepted 2,977. This is proof that these amendments were not all that pointless, and that the Chair could very well continue to do the work as it is doing it now.