I think there's a general consesus in this forum not just that the area at the back should be maintained but that, legally, it must be maintained.
If I were you, I'd be having a cup of coffee with the EC office bearers and telling them (very politely) they can either do this the easy way – just pay for the garden to be tidied up and maintained – or the hard way: fight it through the CTTT and then pay for the garden to be tidied up and maintained.
What they can't do is ignore the issue because doing nothing is legally not an option.
If you can take along a number of valid quote for the work from contractors who already work in the area, then there's not much in the way of an argument they can put up against it.
JimmyT