The front extension, by virtue of its projection from the front of the building, would constitute a prominent and obtrusive structure which would detract from the appearance of the building and by a matter of degree would depart from and disrupt the building line of the existing shops. As such, it would fail to preserve the character and appearance of the Conservation Area, contrary to the Council's policies as set out in the Unitary Development Plan, in particular, Policies CD25, CD44, CD52 and CD53.