Coverage included on Region 1:
National Grid Squares: SW, SX, SY, SR, SS, ST

Coverage included on Region 2:
National Grid Squares: SU, TQ, TR, SZ, TV

Coverage included on Region 3:
National Grid Squares: SM, SN, SO

Coverage included on Region 4:
National Grid Squares: SP, TL, TM

Coverage included on Region 5:
National Grid Squares: SH, SJ

Coverage included on Region 6:
National Grid Squares: SK, TF,TG

Coverage included on Region 7:
National Grid Squares: NX, NY, SD

Coverage included on Region 8:
National Grid Squares: SE, NZ, TA