Discounting anything that is already out or on the cards, these are on my "hit list":
Spyders Web
Marty
Colour Me Pop (what's left)
Freewheelers (especially series 1 and 6)
Mr.Rose
At Last The 1948 Show (the complete original eps)
VT Special Branch
Out Of The Unknown
Department S
60 minute Danger Man
Tightrope
Big Breadwinner Hog
The Gold Robbers
Man In Room 17
Manhunt
The Wednesday Play / Play For Today
Half Hour Story
Z-Cars
Q5 (surviving eps)
Undermind
Armchair Theatre
Armchair Thriller
Object Z
Jazz 625
Top Of The Pops (all '60s material and early '70s; complete eps)
The Corridor People
Callan (a complete and restored release)
Sample editions of schools and children's programmes
more public information films
Orlando (what's left)
1960s Anglia single plays
Weavers Green
Public Eye (the remaining 2 series and odd '60s eps)
Thirty Minute Theatre
Seven Deadly Sins / Virtues
Till Death Us Do Part (all the '60s remains in one place)
Not Only But Also (complete '60s eps and all the '70s colour inserts)
Crown Court
Not That's Me Over Here
The Odd Man
Doctor In The House / Doctor At Large
Thank Your Lucky Stars (all surviving eps incl. Merseybeat edition)
Ace Of Wands
The Power Game (series 3)
Mrs.Thursday
Omnibus / Arena (selected editions)
The Main Chance
The Human Jungle
The Expert
Ready Steady Go (a proper compilation of all surviving material and the few remaining whole eps)
Doomwatch
The remaining eps of Rediffusion dramas (e.g. The Informer, Crane, A Man Of Our Times, The Ratcatchers etc.)
...and that's just me getting up to speed!