Hello @EuroTradeCenter,
thank you for posting here. Although I am not doing FBA in the UK, I believe there has been a recent change, along with all the related UK establishment matters.
If you are EU-based and not UK-based, then you normally wouldn’t be eligible for the import VAT refund.
Here you can review HMRC’s interpretation of the recent VAT legislation on excise duty:
Maybe this will also help: Should we pay these charges?
It would be the best to consult an accountant, however, if you are already using both FedEx and an accounting company, it means that you would no longer get the duties reversed.