Had It in Holland Park

The problem is professional politicians.  
When one is measured by winning, the results are inevitably as you describe.  

The solution is 2-term (or 10 year) limits on all members of parliament.  They should come from  jobs in the community and return to those jobs after completing their stint in public service.   Then the motivation would be to make a positive mark, not simply to continue a career.  Lest anyone worry about loss of experience: any Parliamentarian that has served two terms may stand again after a 10-year hiatus.