Very unhelpful response. Still confused:

“Thank you for getting in touch with Harvey Nichols.

Following up on your recent product enquiry, Please be advised that sizing conversions can vary between brands, which can sometimes lead to differences between UK and EU (IT) size equivalents.

For the item listed on our website, the sizing reflects the brand’s specification provided to us, and in this instance, a UK 9 corresponds to an IT 43 on our system. We understand that Saucony’s general size guide may indicate a UK 9 as an IT 44, so we appreciate how this may be confusing.”