The exchange rate of the pound sterling to the U.S. dollar varies, but between 2009 and 2013, the official exchange rate stayed somewhere in the region of 60-to-70 pence per U.S. dollar.
A general schedule is the pay scale for United States government employees --- consisting of 15 grades, ... you get step increases...ntering Government Service. When a person is hired by the federal government, the employee is assigned a pay grade within the job series, depending upon his or her knowledge, education and experience. For instance, an entry-level biologist with a bachelor's degree may enter federal service as a GS-5.
Just like with active duty BAH, your housing allowance may change at the end of the year. If the rate goes up, you will see an increase in your first payment of the year. If the rate goes down, it will only apply to you if you change schools or have a gap in training of greater than six months.