probably not,as any recipts you may have will pre date your bill of
sale.
but definitley worth trying if you do have an invoice for the
work done that you can submit once you receive the
customs valuation for the
boat ,showing that a portion of vat has been paid.
i was able to write off most of the vat due on a
boat i built in
cyprus,pre vat,after doing a
circumnavigation,then opting to pay the vat there 4 years later after they had joined the eu,by showing receipts that i had paid vat on all the materials at the time.
though i suspect this would not be the case if there was a change of
ownership.