[KaiserPro]

There is (https://www.nist.gov/pml/time-and-frequency-division/time-se...) and in some conditions you can receive the time signal in the UK.

Our office manager bought some US tuned radio wall clocks, and every now and then they would jump 8 hours forward. I assume it was down to solar weather making propagation changes (https://en.wikipedia.org/wiki/Sporadic_E_propagation)

[BenjiWiebe]

Could easily be solar weather related propagation changes, but probably not Sporadic E specifically - that's much higher frequencies.