Here's a pic. of an App's bloodworm pattern, it's an absolute cracker for uk stillwater trout.
Really simple and nothing to it, but it don't half catch rainbows over here.
Hook. kamazan red, standard 10, or a nickel 10's fine.
Legs. Blood red flexi-floss.
Body. Glo-brite no.5 floss.
Rib. Blood red flexi-floss.
Thread/head. Uni 8/0 wine.
Give it a try