Amnesty Wall (not too much of a walk either) stays dry in rain - especially rain and wind from the S or SW. It's also quite a bit steeper than it appears. Some nice sport routes. Some of the routes can even be climbed when they are wet - the pockets and jugs are so big. eg Tyrants and League of Nations climb well when wet - if fact Steve Chapman did the FA of LoN with water coming down the cliff! The 'shower' from Chinese Water Torture can be equivalent to rain too!
Grades from 22 - 25 on the main Amnesty Wall. Rob Booth's newish routes on the left wall are also surprisingly dry in heavy rain.... and they are the easiest at 20. Check out the ACA site.
Michael