So we're saying that the RAF (or indeed, UK Mil as a whole), has no central plan for timekeeping? Despite the 10s of billions spent on all manner of kit that requires accurate timekeeping to function, there is no standard reference that all can use?
In the absence of such a thing, units use a well known "accurate" reference. Yet (speaking as a telecom engineer), it won't be any more accurate than a second or even two by the time it gets to the end user. Even then, a "pip" is hardly accurate. Do you set your watch running at the start or end of the pip? Presumably, aircraft systems also have time references. How are they synced?
In the meantime, my phone gets its time (and timezone) from the network. My computer gets its time from the USN's time.gov. My watch gets its time from WWVB at Ft Collins. So does my alarm clock. They all keep time synchronously.
This isn't a difficult problem to crack.