Heads up everyone - as per subject, those responsive email designs based on media declarations do not appear to work in the Gmail iOS app.
I should have realised - even though it's an app the rendering is being done by Gmail, and Gmail strips out CSS from the header, and the media declaration is in the header.
This is the case with all Gmail on all OS and devices. Personally I'm not a fan of media queries because of this. Admittedly, I happen to be a Gmail user...
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