Yes.I've been following the discussion but not contributing as I've no experience to contribute. My Plan B is the Carib, I did the med up to 2017 then brought the boat back to the UK. I dont think its just you, it seems anyone with only UK citizenship residing permanently in an EU country will face the same difficulty travelling solo outside their country of residence.
I do not blame Brexit, the UK, or Greece. I blame the power crazy fools in Brussels for placing 27 far flung countries under a collective 3 month tourist limit. The Med countries had only one advantage over their Northern neighbours and that was sunshine and Med beaches but that has been ripped off them. The poorer countries of EU, Portugal, Spain, Italy, Malta, Greece, and eventually the adriatic states will have to share the 3 month tourist pie from the rich countries like USA Canada UK, Australia New zeeland and many others. They imagine that tying a noose round 27 countries will bind them together more tightly is a good thing. Yeah right.
Remember before the EU each country allowed tourists for three month, some for six month. Ooops I had no intention of ranting off like this. I am effectively trapped inside Schengen because of my resident status and my disapointment in what started as a trade agreement has been hijacked by sociapaths in Brussels.