Probably not, I don't remember it
On a day trip to Calais years ago, my BIL forgot his passport. We had the kids in the back so we decided to just try and smuggle him into France and it worked. Coming back was a little harder, I had to get out and try in broken French to explain how we had a passenger with no passport but luckily, BIL is the exact clone of ex Mr Twass [his bro] so they could clearly see he was a relation. I made out he lost the passport during the day while in France and that it "fell out of his pocket"

Could they have fined us?? Or worse?