We are moving to a new house in a few weeks and I would love some help and ideas on how to tackle it's rather large drab garden.

It is a corner circular plot laid only to lawn - not one plant!. It has a 3 foot wall all around it - but being on a hill it means that the whole of the garden is completely over looked.

What can i grow or put up to give us some privacy. I would ideally like a fence/ trellis around- so i can grow climbers or something. Can you fence a circular wall?

Help please