there needs to be rule changes. one possibility is that anyone must have been a member for six months to be involved in leadership selection. this will help end "instant" tories with little or no attachment to a party.  the other possibility is primaries like in france, where voters pay a modest fee before voting to elect  the presidential candidate of a party.  such  voters need not be members of that particular party, and when it involves millions of people it is hard to skew the result.