Long shot, but does anyone (probably either Evans staff or @jameso) remember there being an issue on 2015 Arkose fork steerers/headsets.
Mine has always been virtually impossible to keep reliably tight, and I'm sure I saw something a few years ago about the issue.
All other bikes are fine so assuming no user error here. Can tighten headset, good for a few days they inevitable slop comes back. Hasn't bothered me for a few years as it was turbo bike, but back commuting on it again and it's annoying.
Not exactly looking for a refund but wondering if a new headset would do the trick, or if new fork is necessary.