Is it a plot or not?
The red line shows the boundary of the built up frame work.
Built-up area boundaries are used to identify the areas within which developments may be appropriate, including infilling plots, redevelopment and conversion of buildings but they do not necessarily cover all existing developed areas.
Development outside built-up area boundaries is strictly controlled and normally limited to uses which are suitable for a location in the countryside and have a demonstrable need for such a location. This may include uses that are necessary to sustain the countryside as a varied and productive area, such as some farm diversification schemes.