You can get a link for a free professional Commercial Invoice template on this page. But first, we must remind you that several documents are required for International shipping from the UK. Commercial invoices are one of the most important, and it's pretty easy to make a mistake if you don't know all requirements. Failure can mean not only delays to your shipments but even seizures at customs.
Here is a checklist of what a correct Commercial Invoice should include:
Also, if you import to the UK, you must check that your supplier made a correct Invoice. You can send your international partner a professional template as an example. You can get a free professional template right now: