http://www.natureswayhealthandbeauty.co.uk/gta1a.jpg their system appears to
be converting incorrectly as they say we owe them 1260 EUR, which is the
equivalent (at their quoted exchange rate) of 998 GBP and not the 880 GBP
quoted (which would be 1112 EUR).

If you have a copy of the original order page showing the lower
prices, initiate a chargeback via the credit card, and provide them
with the costs you expected to be charged.

(other than that, refer to the answers to the same message on
uk.legal)