According to the neighbours the garden had been unattended for about a decade. In that time many hundreds of saplings (they looked like ash) have taken root. The small ones could be pulled out by hand but most needed digging out. Not hard but when you have hundreds it can get tiring. Spend two weekends on it so far and probably have half the garden cleared.
Worse than the trees are the creepers which are thick on the ground and like to put down roots every 6 or so inches which makes pulling them out hard.
The garden is a good space and we will first get accustomed to the levels and how we start to use it before we do anything. Currently we are thinking of some lovely blossoming trees and beautiful blue stone walls. We will visit https://www.opus40.org/ again to give us some inspiration.