There are notable male companions such as Brigadier Lethbridge-Stewart as well as Jamie. The Brigadier is one of the best Doctor Who characters, a military man who is adaptable and can deal with strange situations.
The Brigadier got some great lines:
* (To other soldiers) "Chap with the wings - five rounds, rapid."
* "Most of their work's so secret, they don't know what they're doing themselves."
* "Look, just tell me this: Are you or are you not the Doctor that I met during the Yeti business and then later when the Cybermen invaded?"
The BBC can be very pigheaded, i.e. offering no incentives for people coming forward.
Even without losses, they have a trackrecord of stockpiling a lot of old content but not making it available to the public. I doubt this would happen to Doctor Who but it would elsewhere. You would think with streaming that the BBC could make a lot of obscure old content available, but they don't.
Sherlock Holmes is great. Tinker Tailor was repeated through my childhood, so I saw it a few too many times. I watched it again recently and found it slow... However the cast of it and Smiley's People are great. Karla is a notable early appearance of Patrick Stewart.
There were some great period dramas at the time, if a little set bound (like I, Claudius)