Yes 17,378,581 67.23%
No 8,470,073 32.77%
If you watch some pre-vote videos Cameron did look very much for a passionate Remain vote. If you then look at the turgid speeches by Corbyn on the why the EU was a good place to remain (one I recall had only cleaner beaches as a positive) was Far from convincing. I would also argue the Tory party was split much like the voters they represent.