In US terms, this is a front post treble (fptr).
How to do it:
- yarn over twice
- insert hook around post of previous stitch, from right to left
- yarn over
- draw yarn back around the post (4 loops on hook)
- yarn over
- draw yarn through 2 loops on hook (3 loops left on hook)
- yarn over
- draw yarn through 2 loops on hook (2 loops left on hook)
- yarn over
- draw yarn through 2 loops on hook