EcomShip

Hello, any help or advice needed bit of a unique situation, We are drop shipping, only within the uk, straight from retailer straight to customer so technically the customer is the importer on record and Vat is paid on the goods via this again technically via the customer on record. Recently the selling site we use now charges vat on the seller fees which is has took a most of our profit so we have to voluntarily register to claim back this vat from hmrc. We are not far off the threshold. How would this work with the VAT return and how would we account for VAT in this situation? Thanks for any help.