GracesgranMK2
"He has been a very good Speaker for Parliament Jess and he is independent of Government (which may be his problem)."
Why a problem? The government would expect him to be Independent of government, he must be seen to be independent of ANY/ALL political parties in Parliament.
Bercow has a duty in accordance with position of Speaker.
'The Speaker is the chief officer and highest authority of the House of Commons and must remain politically impartial at all times.'
"Speakers must be politically impartial. Therefore, on election the new Speaker must resign from their political party and remain separate from political issues even in retirement. However, the Speaker will deal with their constituents' problems like a normal MP."