Chaps,
Thanks for replying so promptly, I knew I could rely on the forum.
The Wharfe looks a huge river compared to my southern brooks and streams. Looking at the photos there does not seem to be too many bushes and trees to inhibit casting so at least I should be able to finish with the same number of flies as I started with, that will certainly be a first.
To be able to fish new rivers is always a thrill even if I remain fishless, it's just great to be out there.
Looks like I need to add some Northern spiders to my fly box !!
Thanks again.