1

Thread a blunt needle with 30cm of yarn. On WS (wrong side), anchor yarn by threading under 4 or 5 stitches, finishing behind stitch to be darned over.

2

Bring yarn to RS (right side) at base of 'V' of knit stitch to be covered. Take needle right to left under base of 'V' stitch above one to be covered.

3

Draw up yarn so it sits neatly on the surface without puckering or hanging. This will form the right-hand 'leg' of the stitch.

4

Take thread back down through the bottom of the 'V' to be covered, where you began the stitch. Both legs of the 'V' have now been covered, making one duplicate stitch.