Possible Clues:

• Northern prison officer turned up, drafted again
• Outlined again
• Brought back new prison officer to be sketched again
• Changed, as district lines
• Constituency boundaries will be — bloody harsh on Corbyn, ultimately?
• Depicted again
• Northern guard sent back to be put in the picture again
• Delineated anew in scarlet and green, using last bit of crayon
• Provided with different plans as new guard turned up
• Depicted afresh