Generally MME is a good place to divert to, if they are open. Assuming they are you also best have a contract in advance to stop yourself paying over the odds for handling. But if you do get in they are pretty good at dealing with the unusual.
copied from NCL thread (Maybe should be here..):
Newcastle had also taken in at least two Ryanair Diversions destined for Liverpool and one Jet 2 scheduled to Leeds Bradford due to fog at those airports earlier.
Wonder if DTV was equipped (Fire/Emergency/Border staff etc...) to take 737s and logistics for onward transition of passengers at the times all this played out?