If you’re taking it on to the continent yourself you’ll also need “A boards” on the front and rear of your truck. I also used to have reems of paperwork from various German regions and a route I had to stick to, though that could have been because it was also an ADR load as well. This was all over 5 years ago now so my memory is a bit hazy but there was a huge amount of paperwork involved and the presence of A boards was like a flashing beacon to the ■■■■ Turpin’s of Europe who loved to pounce on you to try and catch you out on some small technicality or another. I would hope there would be less BS with something such as scrap metal and other non-ADR loads but who can say in this day and age of total bureaucracy.