Layer Estimates:

Layer: B10 Mastermap Text (ID:0)
Count: 47
Extent:

XMin: -361078.674360355
YMin: 7550832.53658275
XMax: -360428.758811283
YMax: 7551904.8837947
Spatial Reference: 102100 (3857)

Layer: B10 Mastermap (ID:1)
Count: 777
Extent:

XMin: -361154.648909476
YMin: 7550677.22403118
XMax: -360349.515946849
YMax: 7551935.10494493
Spatial Reference: 102100 (3857)