Gillingham begin the second half of their pre-season programme today as the relentless work continues. The Gills have four friendly fixtures left and plenty of training in between before they kick off their League 2 challenge at home to Carlisle United on August 10. More: Bonner confirms Bradley Dack interest Dartford are up next on Tuesday night, before they take on National League Southend United at the weekend, a match against Southampton’s under-21s behind closed doors the following week and then a trip to Woking on Saturday, August 3. “We have a busy two weeks now,” said manager Mark Bonn…