I cannot remember where it was in 2015 and perhaps 2017, but there was a big fuss made somewhere when a large number of people turned up to vote at about five to ten, and could not all vote as polling stations close exactly at 10.
AIBU to suggest you vote as early as you can tomorrow, as I would not want anyone to be denied the opportunity to vote who wants to? Some people are so used to being accommodated when they are late for things, but this is one where lateness is not allowed for, without exception.