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They look awfully close together, would it not be better to cut the sick one out and monitoring the other two. You might find that once they're not all competing for space and water they remaining two might recover
Is that canker or shadow I can see on the trunk behind?
leaf curl is generally a result of viral infection often caused by aphids/ mites but there could be something else going on
I'd start with Rory's suggestion of removing the sickest, middle tree and giving the other two some tlc - eg feed, organic pest spray
Thanks for the tips, yes these three are planted about 6 foot from each other, very close on a small lawn. Not sure the soil is that great either, not dug this section to see, but if it's like similar gardens on this estate then there's 4 inches of top soil over compacted clay and stone.
There's been no rain for about a month, (until we had a big downpour yesterday) so have instructed customer to water well, and we'll see if it survives. If not then natural selection will take care of it ! Thanks once again for your advice.