Learn the basic knots using Strawberry Laces. Once you've got each knot right you can eat your lace.
Packs of Strawberry Laces (ASDA do 3 for Â£1) and knot books
Most useful knots for badges are reef knot, fig of 8 and clove hitch or bow:
1. Pick knots from the books, demonstrate with rope, and get the children to learn to tie them using the strawberry laces.
Once they have tied each knot correctly they can eat the knot.
2. Give each person in the patrol a lace, ask them to tie them together using reef knots - winning patrol is one with longest whole chain of laces.