Choose an initial search size from the dropdown. Click ‘km’ to change to 'miles'. Type in a postcode or area then click 'search'. Adjust the size of the circle by dragging the white resize handles. Click and drag from the centre handle to move a circle.
Add further radius by either typing another postcode/area into the search bar and clicking search or clicking on the map. Each radius will be shown in a different colour. Click on the ‘x’ next to the name of the circle you wish to delete.