The landscaping guidelines from the estate are quite unclear, it specifies that the minimum requirements for the landscaping is 2 x 2m trees in the front of the property, which we had done. We contacted our estate manager, who was absolutely no help at all and really had no interest in listening to us or answering our questions, she simply palmed us off to the architects.
We called the architects just to get clarification on what exactly was required, funny thing was that they didn't even seem to be confident in what they wanted. We explained that we cannot plant trees/hedges on both sides of the property since the drive way was very close to the fence on one side and the roots of the trees/hedges would eventually grow to damage and weaken our slab. The response was that we only need to plan things on one side of the boundary. Plan was updated and resubmitted to the builder to pass to the developer. Fingers crossed it gets approved.
Lesson for those designing a garden - spend some time researching the trees/plants you would like to have in your garden, especially paying close attention to the roots and how wide they grow. You don't want a plant that has really wide roots which will end up weakening your slab.