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Have you a wiring diagram SJB for this type of diverter valve.
The frost stat did cross my mind also but the big mystery is why the circ pump doesn't run with the random boiler run.
This is what’s called a W plan mate, not the Y plan. It gives HW priority, meaning once CH is satisfied it will spring return to HW port. Of course if the boiler is getting a feed from somewhere other than intended then through gravity circulation the cylinder will continue to heat until boiler water and cylinder temperature reach thermal equilibrium but you know that already.
It is a Honeywell wiring diagram but this is the principle behind the diverter.