June 2017 is proving lacklustre, with both Baywatch and The Mummy so far failing to crack £10m at the box office.
That’s almost as much as the weekend box office for the rest of the top 10 put together.
Previous Transformers instalment Age of Extinction kicked off with a towering £11.75m, although that number was boosted by six days of previews, contributing £8.04m.
So far this year, ignoring previews, 13 films have opened bigger than The Last Knight, including Beauty and the Beast, Guardians of the Galaxy Vol 2 and Wonder Woman.