Q.Some leaves appear dead but seem to have healthy fruit
As above we have been in the house 2yrs so this will be our 3rd crop the dead levels have only appeared this year. See attached photos.

Certified GKH Gardening Expert
Dieback of branches could be caused for several reasons, one of which is fireblight.
https://www.gardeningknowhow.com/edible/fruits/apples/apple-tree-diseases.htm
https://www.gardeningknowhow.com/plant-problems/disease/fire-blight-remedies-and-symptoms.htm
https://www.gardeningknowhow.com/edible/fruits/apples/apple-tree-planting.htm