Much of Wellington is designated as a Conservation Area to protect its architectural and historic interest.
All areas WITHIN the red boundary on the map are inside the Conservation Area. If your home lies within the Conservation Area and you apply for planning permission (for example for an extension or to build on your land) OR you want to undertake tree work, special rules apply. You can find out more at www.historicengland.org.uk which has a section on the implications of living in such an area.
If you are in doubt about the status of your property or find the map unclear, ask any Parish Councillor or the Parish Clerk for advice.