Some of those I still watch daily i.e. Sweeney, Professionals, Minder, Upstairs Downstairs, Downton Abbey, Morse, Poirot, all currently being shown here on freeview.
I'd like to rewatch Prime Suspect and Broadchurch.
Thunderbirds is so dated for me, yet the original Star Trek from 1966 remains fresh and attractively primeval.
Do you get those old crime series in the States? The Sweeney & The Professionals show London when I first moved there, and classic cars of my youth