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I am not seeing it on my browsers. Is it visible when you're logged out of the site ?

Yes, it appears to be still visible when logged out. I did see that the white line only appears in the chrome inspect for certain models - ipad air it disappears, but for ipad mini the line appears. Surface pro 7 it appears also, so I'm not really sure if this is a google chrome error or whether it is really appearing on those devices.

Strange.

It may be a render issue with those devices splitting a pixel.
Edit that template, select the top most Container Block, and give it a top margin of -1px - does that fix it ?

Yep! That appears to be the problem. Great spot!

Everything looks ok now!

Thanks for all your help.

You're welcome!