The petition lacks authority.
The sample was self-selecting and therefore not representative of mumsnet, let alone women more generally.
The questions:
www.mumsnet.com/politics/general-election/2015/political-culture-survey-results
Do you think that
"That MPs conduct themselves well and the process is effective?"
These two issues should not be conflated. Effectiveness is separate from MPs' conduct. And it's a leading question.
"That they’re not as effective as select committees (for example the Public Accounts Committee)?"
Another leading question. How many people in reality have any idea about the effectiveness of select committees? And it's a false dichotomy. We have select committees AND Prime Minister's Questions. They serve different purposes. You might as well say 'Washing powder is not as effective as red wine'
"That PMQs are a great tradition?"
Another leading question
"That the atmosphere of PMQs is unprofessional & outdated?"
Again.
"That PMQs damage parliament’s reputation?"
Getting silly now.
The proper way to do these questions is:
"Thinking about PMQs, could you tell me your thoughts on their effectiveness'
"Could you tell me your thoughts about how PMQs are conducted'
and then ask people to give their thoughts.
"From what you have seen or heard, do you think the political culture in Westminster is sexist?
This is a leading question.
"From what you have seen or heard, do you think promotion within the UK parliament or government is primarily based on...
Talent and hard work?
Willingness to toe the party line?
Whom you know/ connections/ school/university attended?
Something else?/ not stated"
Another leading question, the correct way to ask this question is UNPROMPTED, i.e. 'What do you think determines promotion within the UK government.'