Actually, the referendum was a secret ballot. Nobody knows who voted Remain and who voted Leave even if they are MPs.
For the same reason, that poll breakdown of remain and leave by age group is not based on the referendum result but on polling by YouGov.
Mine (MP) was definately a "leave" though because it's on his own website.
I think an awful lot of them revealed their stance.
No point in not doing so as they got involved in the campaigns.
It would have been obvious in many cases.
Some labour MP's campaigned with David Cameron for Remain , a lot of them stood up this afternoon in the commons and mentioned it.
It's not that secret.