422,664 people voted in the recent Labour Leadership election.
9,347,304 voted Labour in the General Election
So: there were just over 22 times as many people voted Labour in the General Election as voted in the Labour Leadership election.
Out of the people who voted Labour in the GE and did not vote in the LLE, there may be many who are now disillusioned and will think again opr abstain from voting unless they like the changes that may be brought about in the next four or so years.
That could be a sizeable number of voters, amongst whom are a few I know who, although staunch Labour, are appalled at this result.