Q.Container apple tree.
This tree is in its fourth year. Last year it produced a dozen apples. This year it looks dreadful. There were no flowers and what bit of leaf that came out was stunted Can anyone tell me what is wrong please. Photos attached.

Certified GKH Gardening Expert
Have you checked the foliage for pests? Here is a possibility:
https://www.gardeningknowhow.com/edible/fruits/apples/apple-leaf-midge-control.htm
https://www.gardeningknowhow.com/edible/fruits/apples/pests-affecting-apples.htm