Oh dear , anyway these exports tariffs of 20 p look very nice ,Unless the shed has planning conditions regarding roof colour then I believe the answer is no. All mine have never had planning, butr they were for agricultural use on Agric buildings.
if you arte concerened i would speak planning sure they will be sympathetic.
However myt view has always been , the less they know about these things, the less chance of being rated. Which if it is not agricultural they certainly can