In a food mixer put flour, a sachet of yeast, salt, sugar and bicarbonate of soda.
Measure out milk into a jug and add hot water from the kettle so that the mix is lukewarm.
Whisk the milk in to the flour and then cover the bowl and leave in a warm place for an hour.
Melt a little butter in a non stick pan and place in the rings.
Use a quarter cup scoop to measure the batter into the rings and cook the crumpets over a medium heat until the surface is dry then remove the rings and flip over for about 10 seconds.