Many kettles are made so they whistle when the steam passes through the nozzle. Some kettles are not made that way.

I have one of each!

For anyone who doesn't remember, my Mum was British.

The teapot, now there is a whole 'nother tale. Metal teapots are NO GOOD (although I do have one or two of those as well.) Porcelain, enamel, china. My Mum had ( we still have) 8 or 9 pots. And Mum used a different one depending on . . . something, I never learned what. I just use whichever one I'm in the mood for.