There was one I think by a private medivac company which I can not recall the name of that I seen one night flying over my house at 2300-2359 hrs and IIRC coming from Darlington and landed at St Angelo. Perhaps it was well heeled people flouting lockdown rules on the quiet but who knows, maybe it was a Covid-19 patient/corpse that wanted to be planted in thier native Fermanagh. The airstrip there does not even show up on flight radars website.Ethiopian Airlines is actually quite a big outfit. And well-run. Although Dublin to the Cote d'Ivory is not a regular run.
As you say, a lot of unusual civil flights going on these days. Many of them are repatriation flights. I think Heathrow is getting it's fair share of strange flights, as well.