This is a strange question though, as it starts with "if we haven't agreed a deal..."

So essentially the option of "a deal" has been removed. I'd be interested to see the figures if this were an option. I suspect some Conservatives wouldn't like the option of "a deal" because they tend to be more pro no-deal, and I suspect some Labour voters wouldn't like it because although they favour "a deal" they probably won't like what they see as the Conservative deal.