It's been a lop sided fruiter too @Lizzie27 last year was the first good fruiting, and only on one side. The Elstar is very good for keeping its shape when cooked, and doesn't need sugar, and the Golden Delicious for eating. You could cut it back and re-grow it from lower down if you have thin enough limbs.
@daisym it's not how tall it is, but have you limbs ready to train. Mine was that tall with three ready to train limbs. Remember that the first sets will need to be as low as possible, as when it grows they end up twice as far from the ground. Each year you cut the leader forcing it to branch, making side shoots for limbs, and a new leading stem. At the end of the growing season you choose the limbs in the best position cutting out the rest. So it takes three years to train an espalier into shape. This only works with apples that are not tip bearing varieties, as with them you would be constantly cutting off the fruiting tips. Here is mine after six years. Before and after Autumn cut. This is for fruit as it has reached full size. For growth you cut in March. This is a picture of it in spring, which shows its frame better.
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@daisym it's not how tall it is, but have you limbs ready to train. Mine was that tall with three ready to train limbs. Remember that the first sets will need to be as low as possible, as when it grows they end up twice as far from the ground. Each year you cut the leader forcing it to branch, making side shoots for limbs, and a new leading stem. At the end of the growing season you choose the limbs in the best position cutting out the rest. So it takes three years to train an espalier into shape. This only works with apples that are not tip bearing varieties, as with them you would be constantly cutting off the fruiting tips. Here is mine after six years.
For growth you cut in March.
This is a picture of it in spring, which shows its frame better.