Q.What Plant To Buy?
I am looking for an evergreen plamt / bush that will go into a trough / pot on the ground to climb up and cover a wall and maybe trail over gate? Ideally to grow up to 2metres and approximately 1m wide but with a depth of about 40.

Certified GKH Gardening Expert
From what I can tell of your climate, it looks like minimum temperatures hover around freezing. Here are vines that would be evergreen:
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-8/vines-for-zone-8.htm
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-8/zone-8-evergreen-shrubs.htm