I have tried different lavenders and a couple of years ago planted a 12 foot hedge of Lavender Munstead against a low wall and it has been by far the best one I have had. Evergreen, nice and bushy, and with pale lavender flowers.

As long as the border gets a fair amount of sun, then heathers would be a good choice, as long as you're not on chalk soil. You could have varieties that flower at different times of the year, especially during winter. Trim each one AFTER it has flowered to stop them getting leggy and woody. Another plant you could try (for sunny situation) is Helianthemum. These are low growing evergreen plants that have colourful flowers in summer. They come in shades of yellow, pink, red or orange. I have a lovely double red called ' Cerise Queen', the flowers are like mini roses.

You could also try Lavandula vera, it's growing strongly in my garden even after a cold Scottish winter. Heathers are a good choice. Maybe a low hedge would work, eg Buxus sempervirens (Box), Potentilla, Brachyglottis 'Sunshine', Euonymus or Hebe.

Thank you all! Your answers have Been so useful. This is my first garden so I'm learning as I go. I shall definatley be choosing one of those plants, just got to see which one. Many thanks. I'm very appreciative!