This is a recent plastic 5 year french permit. The problem is, they didn't even have a look at it. No visa- you don't come in.
My advice, don't chance it.

Hello, fresh information as of today December 21, 2018. I was refused to board the plane Nice-London with all the right paperwork - french family member permit, british husband and daughters, russian passport. We lost easyjet tickets. Then my husband booked the 3 of them on BA, but i was still not a...