Weird - Ryanair's own website (at https://www.ryanair.com/gb/en/lp/travel-updates ) only offers current flight status for FR, OE, and RR flight numbers, NOT for "Ryanair UK" RK flight numbers. (FlightAware, FlightRadar24, etc, etc all know the RKnnnn flight numbers).
Not that I ever expect anything reasonable of Ryanair, just curious, how is a Ryanair customer expected to ask Ryanair's website about a Ryanair "UK" flight when it only offers these other three airline codes, and it won't take the RK flight numbers (with or without trying to enter the leading RK).

(At this moment, my wife is cooling her heels - for over eight hours - at EDI, waiting for her flight home to BCN which was supposed to depart at 2:25pm, and is now "scheduled" delayed for departure at 11:20pm ... just short of EDI's night-time noise reduction rules which I suspect don't allow for a fairly heavily loaded B737-800 to take off for BCN at all ...)