I noticed the difference the moment I placed them side by side. One was clearly larger than the other, but how could that be? I used the same yarn, pattern and needle size to knit both hats. I was ...

If you love knitting, there's a piece of kit you have to invest in: interchangeable knitting needles. Wondering why? Then read on, as we take you through what they are, how to use them and why you'll ...