In reply to Martin Haworth:
I climbed Zeppelin perhaps 2 years ago and there were no issues then, I can't see that the access would have changed much since. Technically you're not supposed to climb Zeppelin now, hence they removed it from the Rockfax guide but people still do anyway.
Basically you need to access the railway bridge and then scramble down via one of the train tunnels, the best place to get on the railway changes over time. I remember they added some improved fencing to stop people getting onto it around 2 years ago but it still wasn't too hard to get on if you jumped over at the right spot.
Post edited at 19:07