Hi Rick, unfortunately its not a crane, just another Cherry Picker on the floor below the only way to access the Green Picker in my photo (at about 650ft above the street below) which has broken down and I have to repair it, its also sitting on top of an open shaft core to ground level (i believe).
I had to change the starter battery and then work on both sides of the engine. I then had to test the machines control functions from the lower controls (located on the turret) and then I had to reposition the cage (I'm standing in when the photo was taken) next to the repaired Cherry Pickers cage, then simply get out of the cage walk along the steel beam and get into the other cage then function test the machine. Return to the steel beam, get out, walk along, get in, and return to the floor below,....simples.... all in a days work
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Photo's attached are a larger photo of the Picker and The Leadenhall Building the red square is where the picker was located when I repaired it, obviously the building was almost finished in the second photo, but it does show the height where I work at times....
Unfortunately the building is now wind and water tight, but if there's ever another tall build in London, I'll possibly be up there in the dry, rain, snow and if I'm lucky sunny n warm...