In his speech to business leaders, David Cameron is expected to acknowledge that we're living in "perilous economic times".
"Turn on the TV news and you see the return of a crisis that never really went away: Greece on the brink…the survival of the Euro in question," he is expected to add.
"Faced with this, I have a clear task: to keep Britain safe.
"Not to take the easy course - but the right course."
More top news
An urgent warning has been issued after seven people became seriously ill after taking what is thought to be a type of MDMA.
A 16-year-old boy accused of raping of an eight-year-old girl in a Manchester park will appear in court today.
Holding on for Monday. More unsettled from Tuesday