Yes, you can set a separate delivery address when you checkout.
BFPO Addresses Based Outside of the UK
To request a VAT refund for a BFPO address outside of the UK, please email us once your order has been dispatched. Remember to include the order number with your request.
A list of valid BFPOs can be accessed through the following link: https://www.gov.uk/government/publications/british-forces-post-office-locations