Apologies if there's already a thread on this.
From BBC news feed today (no direct story link is available as yet).
"British voters have to know there will be no kind of any negotiation. We have concluded a deal with the prime minister. He got the maximum he could receive, and we gave the maximum we could give, so there will be no kind of renegotiation."
Does strongly indicate that 'reforming the EU from within' is a bit of a non-starter.