Why is it that when I sign in and try to buy a product it's listed in euro's and not in GBP
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Maybe your location on your account is wrong (assuming you are in the UK)?
Or maybe there is a stray cookie on your device.
Try this:
https://www.sonos.com/en-gb/shop
If
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.