To say the least this is an unusual decision! 

The decision, as reported in Planning Magazine, appears to suggest that a 'clean up' notice served by the Council can be used for them to tell you to repaint your home.  The report suggests that the judge decided that the current paint job might harm those walking by. Surely not? 

I would be interested to see the transcript. Is it the Nanny State gone mad? Is the repainting harmful to amenity, or simply in bad taste? But seriously, if this decision is as reported it may have serious implications for property owners in conservation areas - not just the fashion police!