Possible Clues:

• Somewhat nondescript old PM and his bats
• Reg and I shy, perhaps – or quite dull?
• Rather monochrome
• Shady literary hero is hot but fairly dull
• Grand king looks down on the old getting sent up, his bent being rather gloomy
• Goes around grabbing oats and honey for last three characters in 34 across? It's neither black nor white!
• I become rather a shade drab when shy Reg is around
• Neither black nor white