According to this here Guardian article, the film grossed only £88 in its opening weekend. Maybe that was due to an opening day rush?
On its debut Sunday, box office takings were £9, meaning one person bought a ticket.Indeed, as the Guardian so astutely noted, the viewing public "stayed away in record-breaking numbers." I love that turn of phrase.
Later on in the article you also learn that there were multiple screens involved so it's not like this was a case of being screened solely at a small, out-of-the-way cinema at 11:05 am on a Sunday morning or something. Nah, it was in slightly wider release. Especially damning are the reports that even those with tickets to free screenings couldn't bring themselves to watch the whole thing. Sure, it may be easier for Walky McWalkersons to walk out of something free since you've got nothing to lose except your time, but in this case it's just funny.
It probably also doesn't help that Uma looks like Sarah Palin with a dye job in the publicity still.
Maybe if they went IMAX 3D...