On May 3, 6:50*pm, "Bertie Doe" wrote:
Thanks all. No chance of leaf scorch as it doesn't get any sun till late
afternoon. April's been wet here in Cornwall, up 75% over last year. Maybe
the dry March played a part.
It's planted in the ground, stands about 2 metres tall. It's 7 years old.
I've given it a compost mulch, tomorrow it'll have the suggested nitrogen
feed.

I think I'd give it a dose of sequestered iron, as you say your soil
is neutral to acid,
it could be clorosis due to the soil not being acid enough.