Here is a horrible warning to keep your apple trees pruned as you go along. It is in the south west corner of our small terrace garden.
Big trunks were obviously sawn off which has given it an ugly shape and made it send up all that whippy vertical growth.
Not much blossom/fruit last year and lots of the leaves were curly.
I feel there’s nothing for it but to cut down, grub out and replace with another garden tree, although I suppose I could prune it to a stump and cover it with a rose/clematis?