Baby Apple Tree

This is the James Grieve apple tree we planted in the Spring. I was surprised and delighted to see it has some baby apples. I was less pleased to see the greenfly on all the new shoots. A busy colony of ants were 'farming' the aphids. I've read about this but never seen it before.
https://www.pestuk.com/blog/how-do-ants-farm-aphids-ants-help-aphids-to-destroy-garden-plants/