This is the center rack on the Gully Slab Wall. Once on the ledge below the crack, step up a bit on good footholds to get your hands in the crack. As you step up more, you can transition completely into the crack, which you can continue until you reach the shared ledge near the top of the route. There are many face holds and feet, keep off these if you want to practice your crack climbing.
Towards the top, you reach a ledge shared by all three routes on this slab - this is probably the crux for many, as you need to climb up onto a slight overhang. By climbing all the routes on this wall, you could make various attempts on this top portion.
It is not a bad route if you want to introduce someone to crack climbing - they can switch to face holds if they get tired and it's low angle, so not as painful as complete vertical.
This is at the far (left, north) end of the wall. After finding Radio Head, walk all the way along the wall where you'll likely spot the slab itself, but you'll also see a somewhat dirty gully which takes you up to it. There is ample space to sit, dump your gear at the top of the gully.
Most simple would be an assortment of finger and hand-size pieces.