Here's how I do them:
Put a heavy cast iron pan on the hob at about a 5 (this is the only recipe that is easier on an electric hob).
Melt 2 tbsp butter (I use salted) in a bowl in the microwave. You want it not to be really hot - say 30 seconds on high and then stir until any unmelted bits have melted.
In a largeish mixing bowl mix 1 cup flour, 2 tsp sugar, 1/2 tsp baking powder, 1/4 tsp bicarb.
In a jug mix either half a cup of milk and half a cup of buttermilk, or 2/3 cup milk and 1/3 cup yoghurt. If these ingredients are fridge-cold, microwave them for 30-40 seconds just to take the chill off (not so that it's more than tepid when you dip your finger in).
Separate an egg. Mix the white in with the jug of milk and yoghurt. Beat the yolk into the melted butter.
Scrape the melted butter/ yolk into the jug of milk and mix thoroughly.
Dump the wet ingredients in the dry. Stir until incorporated but not until absolutely smooth - it should look a bit like porridge.
Smear a thin layer of oil into the pan (I pour some in then wipe the excess out with kitchen paper). Fry the pancakes a quarter cup at a time. Do the first side until the top starts popping bubbles, then flip and do for another minute or so. Keep an eye on the temperature of the pan and turn it up or down. Re-oil the pan if it looks dry. Keep the finished pancakes in the oven on 100 degrees until done.
This recipe makes 7-8 pancakes and is the best one I've tried.