Cameron’s EU poll bounce – was that it?

Regular LabourList readers will know that although I was expecting the Tories to get a poll boost out of Cameron’s Europe speech, I was also quite surprised at how small it was. Now the Labour lead is back up to 9 points with YouGov. Does that mean the Cameron bounce has ended  just a week after the speech? Labour’s poll lead is still smaller than it was before the speech, but it seems to have stabilised and perhaps even started growing again. This chart suggests so:

(h/t: Mike Smithson)