Young one,
The Urie can be difficult to fish especially in high summer where often the bankside vegetation is 1 foot higher than your head (depending where you go)
also being narrow and often awkward to negotiate stealthy fishing can be tough. It is very deep in places and also has many sections of muddy bottom so wading is a no-no on most of it but essential when fishing my favourite pool.
Try the 'Klink and Dink' method. Black Klink with a hi viz wing post and an olive nymph, Hares' Ear or PTN dropped of its' tail. I found this good for either dropping behind or between weedbeds.
Obviously upstream dry fly, again Sedges, Olives, Beetles, whatever is interesting the trout.
Down and across wets, spiders, nymphs can be done effectively on a few sections of the river.
Hard work but there are decent fish there.
Have to go
Iain