I was on the Wharfe at Bolton Abbey last month and had 14 to spider patterns, mainly Partridge and Orange with a couple on Waterhen Bloa, fished across and down. Had the good fortune to bump into a local guide called Stuart Minnikin who has an excellent website detailing fly patterns, beats and general advice. It's a really good site.
http://www.yorkshire-dales-flyfishing.com/index.htm
There's also a DVD by Oliver Edwards called something like 'Spiders and Upstream Nymphing', with demonstrations of tying and fishing which is well worth watching.
Tight lines
Marra