They do count them and they do report them. See "Rejected ballot papers" https://www.electoralcommission.org.uk/who-we-are-and-what-we-do/elections-and-referen

They do count them and they do report them. See "Rejected ballot papers" https://www.electoralcommission.org.uk/who-we-are-and-what-we-do/elections-and-referendums/past-elections-and-referendums/uk-general-elections/results-and-turnout-2017-uk-general-election https://www.electoralcommission.org.uk/who-we-are-and-what-w...