Cream the butter and sugar together in a large bowl.
Add the egg and vanilla essence and mix.
Add the oats and mix again.
Sieve the flour and baking powder into the bowl with the other ingredients.
Chop the dried apricots and break the pecans, add to the other ingredients and mix well.
Form cookie shapes by hand (about 3cm/1.2" diameter) and place on a non stick baking parchment on a metal baking sheet, leaving around 2cm (about 0.75") between each cookie to allow room for expansion.
Bake in batches in the centre of the oven at 180C, 350F, gas mark 4 until the edges just start to turn golden. This may take around 10 minutes but check after 5 minutes and again at regular intervals to avoid overcooking.
Leave on the baking tray for a few minutes and then transfer to a wire rack to cool.