I found this two month old document from the UK Government Office for Science about "Satellite-derived Time and Position: A Study of Critical Dependencies". See https://assets.publishing.service.gov.u ... review.pdf for the link. Chapter one and two are the most interesting.
Short version: Oh dear, we're f*d if They(tm) want it.
Long version: It looks at various issues, both in signals, receiver failure handling and impact of absence of the data on the devices which used it.
Enjoy your read,
Edwin
UK government on GNSS: A Study of Critical Dependencies
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Re: UK government on GNSS: A Study of Critical Dependencies
Interesting stuff there.