⭐⭐⭐ Sensory Overload - 23 / 7a 

Sensory Overload is an endurance test piece, an overhang wall mostly on jugs, but with no good rests in the 20m to the anchors.
Celebrity Crags is another must go place around Blackheath, Jimmy Cliffs Wall will cater for grades between 18 and 23 and Sharon Stone Wall will get you pumped on some higher grades, there are also other walls around that I haven't explored yet.