The system is similar in the UK. You go to your assigned polling station (of which there are many - probably no more than a few thousand voters per station, at least those I have known). You hand in the polling card that was posted to you in advance, or provide ID, and your details are checked, marked off, and you get a paper card. You walk to a booth enclosed on two sides, place an X next to the candidate you want to vote for, fold it and place it in the box. When the polls close, the boxes are sealed, and then that night or the next day the votes are counted by hand. I don't know exactly how the scrutineering is performed, but the low numbers of voters per polling station makes this feasible.