Is the problem with HMRC or the US version? Maybe both!
Will your shipping agent be able to sort it? I found them pretty good on the few occasions I needed to sort one off stuff. The only snags I encountered was getting some stuff out of BA Freight in Heathrow. Jobsworths! We did regularly buy in equipment and spares from mainly EU countries but it was pretty straight forward. Part number/description/value but no breakdown to individual bolts! When exporting tobacco products ( cigars) was straightforward but paperwork MUST be accurate for weight based on numbers of cigars at an agreed declared duty weight spec.
