About 80 or so yards up Green Lane from Brookfield there's a path leading to Maresfield Close (pic below, taken 4 Jan). If you enjoy litter, this is the place for you. And if you're lucky, you'll pass a wasted young man in a black & white checked jacket and soiled track-suit bottoms, standing amid the rubbish, smoking a joint while checking his phone messages.
But for a comprehensive litter experience, I'd advise walking Mayfield from Astley Avenue, through Maresfield into Green Lane, then taking a right after the railway bridge up the path to Napier.