I suspect corporations set their own internal exchange rates when dealing with their subsidiaries in different regions and periodically there is a price adjustment. September marks the start of Quarter 3 and this may also reflect the recent devaluations in the Chinese currency.
It's a little deceptive, the vast, vast majority are due to two Calumet discount codes. BANKHOL50 and BANKHOL100. They appear to apply (roughly) to certain items above £500 or £1500 respectively.
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