MRN input into Eurotunnel VP anyone?

Anyone send small stuff over on the Eurotunnel VP freight?

Banging my head against the wall trying to figure out how to input my MRN, just says a non acceptable format no matter how I try it, even did the French customs envelope with the bar code but seems no way to cross link.

I’ve just put this question to a mate who’s currently in Spa for the F1. He does the van stuff for Redbull. This was his response…

“When you do the booking, on the right hand side of the screen is a bar. Do your border pass. Click on the relevant line

Empty
T1
ATA carnet

On T1 you can enter MRN I’m sure”

I’ve tried for over an hr, just doesn’t accept numbers in any format

Sorry mate, that’s me out of ideas.

Just spent about a week trying to sort this out.
Online declaration for commercial goods in baggage or small van. You can dmake an online declaration, BUT, you need TWO EORI NUMBERS, ONE UK & ONE EU, AND MOST PEOPLE SEEM TO TAKE THE IRISH ONE, SO REGS WERE CHANGED IN JULY, SO BUT NOT ALL THE WEBSITES ARE UPDATED.
THIS REFERS TO PERMANENT EXPORT OF GOODS FOR SALE.
HARBOUR SHIPPING HAVE BEEN VERY HELPFUL TO ME, AT NO COST OTHER THAN THE FERRY TICKET.
GOOD LUCK