+--A-Z Maps - Company history
+--antiquemaps
+--CBRD - Welcome to the Site!
+--Coordinate Definitions
+--D-ZYNE - Sheffield Roads Portal
+--Ecclesall Bierlow
+--Election-maps.co.uk
+--Geograph - Photo of every grid square!
+--Grid Calculation Constants
+--Historic Counties Trust
+--Hong Kong (VectorMap)
+--Hong Kong
+--Land Register Online
+--Loxley College site PlanApp
+--One-Inch Maps - Streetmap.co.uk
+--OSGB FAQ
+--Planning Portal - Scarborough BC
+--Planning Portal - Sheffield CC
+--Sheffield SDF
+--Yorkshire old maps