How does one remove a Speaker?

Does anyone disagree that Speaker Michael Martin made a hash of it? But the question that no-one seems to be able to answer is how the Commons can remove an incompetent Speaker if it so desires.

In most meetings there exists the option to no-confidence the Chair, whether on a procedural motion raised from the floor or by formal resolution. But does this option exist anywhere in the rules of the House of Commons? And have any MPs the willingness to use it if needs be?