Layer Estimates:

Layer: B5 Mastermap Text (ID:0)
Count: 127
Extent:

XMin: -360976.295070958
YMin: 7548609.13027479
XMax: -359710.890879082
YMax: 7549614.29221299
Spatial Reference: 102100 (3857)

Layer: B5 Mastermap (ID:1)
Count: 852
Extent:

XMin: -361054.75323866
YMin: 7548541.23803641
XMax: -359652.96361333
YMax: 7549661.85760229
Spatial Reference: 102100 (3857)