Mere Beck
Mere Beck Fly Fishing
Not too far from you and the place is full of rudd and roach (plenty of trout too).
Finding the small fish is easy as you'll see them. The spey river section is usually full of them in warm weather. They will rise freely to a dry fly, often so freely that they can drive anglers crazy who are trying to catch trout.
On most of the water you can see the fish and you'll notice that the trout usually stay away from them.
There's also plenty of room and few snags, so you can fish light and even if you get a trout, there's a good chance you'll land it on light gear.