Did you buy it as a grafted tree, Charlie, or was it grown from seed? If it is a grafted tree, it does have some green in it so it looks like a soil nutrient deficiency. As you say, the other plants nearby look healthy though. Fruit trees don't like competition near their roots though and do need regular feeding. I'd remove all plants with 0.5 metres and give it a general feed with something which states it also contains trace nutrients in case it is one of the rarer deficiencies.
Apple tree with white leaves
It seems to be healthy enough, if slow-growingJump to latest post
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