conservatives will not win this year 's general election because they have n't been able to win an election for 23 years ' as the party has ` become much too right-wing ' .
in a wide-ranging interview with the new statesman magazine , mr clarke also warned against offering ` blank cheques ' to the nhs and foreign aid budgets .
but critics warn the move will place intense pressure on other departments like defence and policing , which will have to bear the brunt of planned cuts .