DoE in photography enforcement

Alan in Belfast reports that the DoE have emailed him requesting that he remove a picture of Edwin Poots and his daughter.

Firstly, this picture was taken in a public place, does the law or anything else prohibit taking and publishing pictures taken in a public place? Secondly, Alan blogged the picture on June 27th. Edwin Poots became Environment Minister on July 1st. Do all images ever taken of Edwin Poots now fall under the remit of DoE Information Officers?