Taking friends motorcycles to France temporarily

A friend is celebrating a big birthday this year and is planning a motorcycle ride in Italy with myself and his 3 sons. The plan is for me to drive a van out with all the bikes, whilst they fly out a few days later due to time constraints … and vice-versa for the return to the UK, they fly back and I drive the bikes back in the van. An overall trip of a week or so. Things are obviously more complex post-brexit - me transporting my own bike in my own van is now accepted and straightforward as it used to be. The complexity is me transporting my friends bikes without them being present. I have researched this a fair bit and have seen various posts online offering anecdotal advice that doing so, as long as I can demonstrate all their bikes are road registered and that I have all their paperwork in hand (V5’s, copies of their return tickets, copies of their passports, letters of authority etc), should now be possible and acceptable to UK and French Customs. However, I can’t find anywhere any definitive statement that this is 100% the case, and I can’t afford to turn up at the port with all their bikes and gear loaded only to be turned around, fined or asked to pay a fortune for Carnet’s. Is anyone able please to clarify? Many thanks, Rob

Hi,
Guidance on taking a vehicle out of the UK temporarily is available on below link.
Taking a vehicle out of the UK
Please check below guidance on how to declare personal goods you bring into or take out of the UK.
Check how to declare personal goods you bring into or take out of the UK
Thank you.