That would assume all of the ex Tory and DUP voting with him as well wouldn't it?
I believe that the calculation assumes all of the ex Tories voting for it, but not the DUP.
He needs 320; he's got 287 MPs. There are 23 ex-Tories who were either expelled or left.
If he gets all of those, then he needs 10 other votes.
There's 3-4 of the other independents who are broadly pro-Brexit....but then again, there's 3-4 of those ex-Tories that are probably going to stick it to him. So yeah, 10-15 Labour votes is probably a good estimate. May got five, so BoJo will likely have to at least double that.
It's going to be close. He could do with more EU leaders coming out with similar rhetoric to Juncker.