The OS continuously revise the map in urban, rural and moorland areas to capture major change such as housing developments, commercial developments and road/rail infrastructure. Their published time scale for picking up the new data is within 5 months of notification of completion.
As new build may be captured by either ground or aerial survey methods, it is possible that there may be some slippage in the published time scales, i.e.
- Aerial photography - the flying season is weather dependant.
- External contractors do some surveying.
- Local staffing resource issues.
- Unforeseen circumstances e.g. foot and mouth outbreak.