Blimmin leaf curl aphid again

Anyone have any tips how to get rid of leaf curl aphid from a cheery type tree? Last year i had to chop the ends off as it was so bad. Theyre back again this year. Taken a few ends off because they were covered. Haven't sprayed it as saw a few ladybirds which I'm hoping will help.

I think the ants are helping the aphids...front garden is v hot and dry and has a lot of red ants.