This is what the Parliamentary Standards Committee said about disgraced ex-MP Patrick Mercer who took cash for questions as published in the Daily Telegraph:

The investigation found Mr Mercer was ‘willing to use his parliamentary position for his own gain’ and readily signed an agreement for consultancy services but failed to register it or declare his interest when tabling relevant parliamentary questions

Read more: http://www.dailymail.co.uk/news/article-2617840/Ex-Tory-MP-Patrick-Mercer-tried-abuse-hie-position-gain-worst-case-seen-Commons-watchdog.html#ixzz30aIX9098
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and in The Guardian:

They reached this conclusion after finding he allowed payment to influence his actions in parliamentary proceedings, failed to declare his interests on appropriate occasions, failed to recognise that his actions were not in accordance with his expressed views on acceptable behaviour, repeatedly denigrated fellow MPs both individually and collectively, and used racially offensive language.

http://www.theguardian.com/politics/2014/may/01/patrick-mercer-tory-mp-worst-ever-breaches-rules