Not be kidded.
This is just a tiny sticking plaster, its for the cameras, the polls and the vanity of the politicians. Cameron...where to start?...airheaded and shallow doesn't do him justice.
The question is how to keep these poor people in their own countries in the first place, and for that nobody seems to be leading at all.
I would pay them money to return - at least double or treble what it cost them to reach the departure ports in the first place, and I would ensure a safe passage return.
Italy has asked permission from the EU to sink pirate boats in port, before they depart.
Establish a safe zone (for arriving refugees, and guarded or set up by EU military) onshore Libya will probably be put on the table, but that will be very fraught and risky I would imagine.