Donald,
You might try using pine squirrel zonkers for very small Matukas. They might work on your small streams. Every time I watch Last of the Summer Wine and see those streams I wonder if they hold fish and wish I could wander them and find out. I realize that's a bit to the south of you and across that fearsome border, but I have been told that Scotland has areas like the Yorkshire Dales as well.
Stay well.
Ed