Thanks for the advice. The soil isn't the best unfortunately, a lot of clay I believe. We have had a section on one part top soiled with a lot of compost, ready for planting a vege garden, the other perimeter area is aiming for big climbers, roses, flowers trees etc - we have quite a big retaining wall and fence. We are about 500m or so from an inlet around the corner so nice and sheltered. I will take a look at the forum you have suggested to get a bit of an idea. I am a complete novice as never really had my own little piece of land, but looking forward to learning!
I absolutely LOVE alyssum so will absolutely plant them, that's some gold advice thank you.