Hi Annie-Lee Cox,
If goods are exported from the UK overseas and the appropriate conditions are met then they should be zero rated.
Please see the guidance below:
Conditions and time limits for zero rating
However, if evidence is not obtained and kept by the supplier then you can not charge VAT at the zero rate .
If the VAT is charged in this scenario then the VAT can not be recovered by the overseas business as it rules out goods exported from the UK in the following guidance:
Refunds of UK VAT for businesses established outside the UK
The only option is for evidence to be obtained for the exported goods so that the VAT is not charged by the supplier.
Thank you.