David Cameron's negotiations over EU reform continued today (Friday), with European Council President Donald Tusk saying "some progress" had been made, but "a lot still remains to be done".
Downing Street said there was "real hard work to do overnight". The Prime Minister and Mr Tusk left the talks at 5:30 local time and resumed early this morning.
There are growing signs that Mr Cameron will secure the reforms he wants, but sources say the differences are bigger than expected.
On Thursday night, a Downing Street source said: "We are only going to do an agreement at this summit if we make some real progress from where we were at 8:30 this evening.
"If we don't, we are not going to have an agreement at this summit. There is some real hard work to do overnight and we have got to see real progress."
It is understood that there are five key sticking points:
- Exactly how the EU treaty will be changed
- How many countries can trigger the "emergency brake" on welfare for migrants
- Restrospective cuts to child benefits
- How long limits on migrant benefits can last
- Changes to treaties on the 'ever-closer' European Union
As he arrived at the summit on Thursday, the Prime Minister said: "I'll be battling for Britain. If we can get a good deal I'll take that deal. But I will not take a deal that doesn't meet what we need."