Adrian wrote:
"Mrcheerful" gurgled happily, sounding much like
they were saying:

Are you able to reclaim the VAT? If not then it makes no
difference, if you can then does the amazon invoice show their vat
number? if so then just calculate the vat amount and input that to
your accounts for vat purposes, if the amazon invoice does not show
their vat number then start asking amazon to supply a bill showing
their vat number and the amount of vat charged.

She didn't buy it from Amazon. She bought it from a company on the
IoM.

Then whichever company supplies the bill is the relevant one to look at, if
the OP is not vat registered then it all makes no odds anyway.