In reply to HannahC:
> Cormorants & Razorbills apparently is that acceptable?
Under the Wildlife and Countryside Act 1981 it is a criminal offence to "Intentionally or recklessly disturb any wild bird listed on Schedule 1 while it is nest building, or at a nest containing eggs or young, or disturb the dependent young of such a bird."
Cormorants, razorbills and fulmars aren't listed in Schedule 1.
For birds not in Schedule 1 it is only an offence to "Intentionally take, damage or destroy the nest of any wild bird while it is in use or being built" or to "Intentionally take or destroy the egg of any wild bird." So if you can climb the route without damaging or destroying the nest or eggs then in theory it's legal: the law doesn't care if you only disturb such species while they're nesting.
IMO, though, it's not particularly responsible or considerate to value a human leisure activity as more important than a wild creature's natural behaviour when the two conflict. And FWIW the overall british seabird population has been on a continual downward trend since the 1980s (as have the populations of almost all british bird species).
Post edited at 12:50