nwncl thanks for the Trip Report, very helpful.
I'll be flying MAN-IST later this year.

Thanks a lot for the report! This has been very helpful cause I too am flying LON-IST-DOH soon with Turkish Airlines. I am also worried about my flight being canceled but this has to do with each country's regulations so I am hoping it's not canceled from either the UK or Qatar.
Other than that I am not too concerned about flying during these times, and I heard Turkish was taking one of the best measures regarding its safety and hygiene.

Yes if feels like in a flying hospital. Wonderful

I went through LHR yesterday and all the T2 lounges are still closed. Economy only had a few spare seats.

I think that you've only mentioned about the *A lounges.
I've heard that the Plaza Premium Lounge in T2 is open at the moment, however, I am not sure if TK is contracting that lounge until the *A lounges reopen. Probably not.