Breaking news - the votes are being counted, except the ones that aren't

Apparently, plenty of people haven't, because they've been turned away. I've coped and posted this because it's from the rolling news coverage and as of yet has no fixed web address:

1. BREAKING NEWSPolice have been called to some polling stations to move on people who wanted to vote but couldn't because they were still queuing outside at 10pm. In the Manchester Withington constituency, about 200 people were turned away. A spokesman for the returning officer for Manchester said: "The law states that the doors to polling stations must be closed at 10pm exactly, and no-one may be issued with a ballot paper after 10pm."

How widespread is this problem? How many voices are not being heard?