Originally Posted by NWIFlyer

That does sound more like what you want to hear rather than the conclusion .

So yes, IST is currently viable.

ATH, one of the myriad of other locations you mentioned, certainly is not - at least, not in the format I’m sure you’d like it to be. Greece currently has a mandatory quarantine and a requirement for a negative PCR test prior to travel. Your bargain BAH deal suddenly wouldn’t be such a bargain, let alone managing the logistics of getting the test whilst potentially in quarantine on your return from a country not in the travel corridor list.

On 1st January, given you’d be relying on your UK passport to enter the European countries, the circumstances may well change yet again depending on the result of the ongoing Brexit negotiations between the UK & EU.

If you were really only interested in IST, then just ask about that. It merely muddies the waters to throw in other places.