Good luck too, LLP!!
LP, One of our group had lost his passport for last years LM so he took his dad's instead!
No checks on the way out. On the way back, we had a serious jobsworth at the tunnel who made us remove hats & sunglasses. He read out my mates dad's name and he did the whole "oh no I must have picked it up by mistake" routine. All the guy wanted was some ID, credit card, in this case. He entered his name into his computer and as he wasn't wanted for anything (other than the fashion police!) he let him go!