Place your girdle/frying pan on a low-medium heat to start warming up.
In a large bowl, sift the flour, salt & sugar.
Whisk the milk & egg together in a separate small bowl. Gradually add them to the dry ingredients whilst mixing together. Once combined, add the oil and mix again until just combined.
Grease your pre-heated girdle/frying pan with a little oil. Spoon a ladle of batter onto the girdle/frying pan. Sprinkle with some raisins, if desired (optional). You may be able to do a couple of crumpets at once, depending on the size of your girdle/frying pan.
Once the bubbles have started to pop on top of your crumpet, and they appear dry, it’s time to flip them. Using a spatula, flip the crumpets & cook the other side for around 1-2 minutes, or until golden brown.
Remove from the heat and place onto a wire rack to cool. Repeat with the remaining batter. Allow to cool completely, or enjoy whilst still slightly warm.