If John Prescott's motivation for being in politics was public service, he would quit. His acceptance of gifts from businessmen negotiating government contracts may not prove him to be corrupt, but it proves him to lack judgement. His reputation (such as it was) is damaged beyond retrieval and his ability to serve in government is diminished.
He knows that. He stays because, as his whole career shows, the "perks" are what it is all about for him. When he was a union rep., he groped the girls and lived at the union's expense. He has done the same in office. He is simply making his way in politics as a more lucrative alternative to any other life for which he is fitted.
Sadly, from his point of view, he has proved himself as unfit for this career as for any other.
BBC NEWS | UK | Prescott defiant over criticism