Layer Estimates:

Layer: B7 Mastermap Text (ID:0)
Count: 213
Extent:

XMin: -352867.731767662
YMin: 7545117.23593574
XMax: -351215.654107305
YMax: 7545898.43862726
Spatial Reference: 102100 (3857)

Layer: B7 Mastermap (ID:1)
Count: 1455
Extent:

XMin: -352881.181572883
YMin: 7545083.62482488
XMax: -351176.124955538
YMax: 7546015.25416928
Spatial Reference: 102100 (3857)