How to knit a 'proper' English tea cosy!

Step 5 Make sure you twist the yarns after the first 3 stitches at each end.

When changing colour from A to B at the start of each row, you must twist the yarns round each other. If you don't do this you will have a "hole" (which can always be sewn neatly if you miss one). However, it is very easy to twist the yarns round in the first place and avoid the holes.