A little bit of history will be created on July 4 when the first votes for the constituency formerly known as North Thanet \- now renamed Herne Bay and Sandwich – are cast. Following boundary changes, a chunk of Thanet remains as part of the electoral area (it still encompasses part of Margate and many of the isle’s villages) but all traces of its name in the seat have been vanquished. And if you believe some of the pre-election poll projections, Conservative Sir Roger Gale – Kent’s longest-serving MP – may be headed the same way. MP for North Thanet since Margaret Thatcher won her second term…