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As often, I cannot get to grips with this because I cannot see through a few of the clues.
So help, please, with 3D: forgotten earth development programmes or concerts (9)
3D I have ?nt?re???
and 6d: runt to stray in fog drifting around university (7) I have ? E?ru??
Clues will either ignore a single letter in word play or have a single letter misprint in the definition.

6d FERRUGO - assuming it's rust[/]i] in the clue
http://www.collinsdictionary.com/dictionary/english/ferrugo

stray = ERR inside anagram of fog with U [university] inserted

Thank you. Perfect fit with other tentative answers I have...

3d: think that it must be INTERESTS which is concerNs

Earth is old or 'forgotten' word for bury or inter so yes, interests it is.

Thank you, both of you. Do you fancy helping with 20d?
King in Somerset ditches shelters (7) I have ??RE??? But unsure of the 'R' same rules apply

Skreens, with S as the extra letter....

In the quotation is it SON or SUN?

Sun