The ground
Lewes Nodular Chalk · river sand and gravel
Compton is mapped on Lewes Nodular Chalk, with no deposit over it at the centre. The British Geological Survey describes this chalk as hard nodular bands interbedded with softer chalk and marl, with regular seams of flint.
Within half a kilometre, the map shows river sand and gravel to the south-east and west; at the other ring points nothing lies over the chalk. On the gravel, soils are lighter and drain quickly after rain, the RHS notes, while the chalk gives very alkaline ground.
Planning
North Wessex Downs · Compton Conservation Area nearby
Compton is well inside the North Wessex Downs National Landscape, with all of its parish in it too. Permitted development there caps the area of buildings, enclosures and pools more than 20 metres from the house at 10 square metres, and a side outbuilding can’t be built without planning permission.
Compton’s mapped centre lies just outside the Compton Conservation Area, whose boundary is about 230 metres away. Inside it, West Berkshire Council needs six weeks’ notice before tree work (trees whose trunks are under 75 mm across at 1.5 m are exempt), and pulling down a fence, wall or gate may need consent.