Wiltshire day Today is Wiltshire Day. On this date in 2007 the Great Bustard flag was flown for the first time at County Hall, Trowbridge. There are three flag designs associated with the county of Wiltshire. Like the proposed flags of many other counties, two of the three have no official status as they were not designed by the College of Arms. One of the designs, the "Bustard Flag", was approved by a full meeting of the Wiltshire Council on December 1 2009, as a county flag and subsequently registered with the Flag Institute. The "Bustard Flag" was created by Mike Prior and designed by Helen Pocock, a graphic designer, in 2007.