The Labour leader says staying a member could limit the government's powers to invest in industry.
The actress, Prince Harry's girlfriend, joins the opening ceremony as he hails injured service personnel.
Dame Kelly Holmes won gold in the 800m and 1,500m in Athens in 2004, but had suffered with injury.
The debate over Brexit in both the Conservative and Labour parties dominates the Sunday papers.
The enduring appeal of Audrey Hepburn
The famed painters who vanished into obscurity
Did Richard Huckle have UK victims?
May's Brexit talk answered many questions... but not all
Women's safety fears over Uber licence loss
What do the class of 2017 say about show?
7 ways to explain the Kardashian phenomenon