I'm not sure if I have much sympathy for them really. It does clearly state that you have to vote at your designated polling station before 10pm.
One of the officers in charge said:
"Many did not have their polling cards, which significantly adds time. Some people went to the wrong polling station.
"And... the absolute laziness from the elector by not joining queues when they arrive, returning at a later time only to find a longer line and re-returning at 2200 BST, which, as it clearly states, is closing time."
news.bbc.co.uk/1/hi/uk_politics/election_2010/8666338.stm