I am abroad and will need to pay customs tax, can you change the value of the invoice so that I pay less tax?

As you are currently outside of the UK, you are not required to pay the UK VAT of 20%. However, please be aware that you will be responsible for paying any applicable taxes in your own country. To ensure compliance with regulations, we need accurate evidence of export to avoid charging UK VAT from the outset, which means we cannot alter the invoice value or falsify export declarations.