NB this list will evolve over time.  Please feel free to make further suggestions.

Not all of these are avoidable, but the name of the game is to reduce their wiggle room

Will give examples as they come in.

“That’s classified”

We’re not going to tell you because privacy, commercial in confidence, too expensive

Partial release (limited hangout)

Answer the question incompletely, or release some embarrassing information while trying to bury/obfuscate the rest

The half-wit

Answer half a question and hope you won’t notice/will be confused/fobbed off/exhausted

Answer a (subtly or crudely) different question

Hope you won’t notice/will be confused/fobbed off/exhausted

Flood the zone with bullshit/trivia

Hit you with insane detail that means you can’t see the wood for the trees (as per 7471669)