In reply to whenry:
Cheers all! I have finally found it.
The easiest way for me was to park in the Haresfield beacon car park.
Head to the trig pointbeacon.
From there head towards the tree line on the right, follow it right to the end, where the line of trees end. (It is crucial you do this otherwise you will miss the crag).
It is here that you will find a couple of paths back into the trees. Take the one on the left which eventually heads downhill slightly.
After no more than 100 meters you will see the rocky outcrop just after a large fallen tree.
Trust me the crag is nails! Packs a punch for such a small outcrop.