Sorry for the crappy photos that don't really show the angle properly.
I've finally reclaimed the bottom 4 meters of my garden from the bastard brambles. The garden slopes up from the top to the bottom but the last part is really steep. It's also uneven, full of thick bramble roots, bits of paving slab and lots of weeds.
Im thinking the best is to dig from the fence down to create a gentle slope, then throw grass seeds over it. I'm open to any better ideas though. I don't have any money to spend on the garden unfortunately so it's whatever I can do myself with basic tools.