The answer is probably drought and more drought.
Willows are very thirsty trees .. two large ones must be draining the
surrounding soil of all water and nutrients.
The recent planting of your acer only exacerbates the problem, as its roots
will hardly have left their pot-circling formation. Given the recent
fiercely hot/dry weather, even your watering regime is insufficient.
Is it possible to move the acer away from the willows, so that it has a
better chance? If not, try and sink an irrigation pipe next to the acer so
you can water the roots directly. Also keep watering the surrounding soil
really well, then mulch to hold the moisture in and also provide a cooler
root run.
This year's leaves will not materially improve now, but they will be dropped
soon anyway. Hopefully, your tree will continue to extablish over
autumn/winter and the new spring leaves will be fine. Keep up with the
watering next year, too, as the acer will still be relying on you.
Hope tree improves.
Spider.

Ronald Green wrote in message
.. .
Hi there

On the Estate (Country House), a Maple Tree (very expensive) was recently
purchased and planted. The leaves appear to be scorched and this has
happened since planting about two months ago. The tree is watered daily or
every other day and not at weekends.

The tree is planted in soil which is mostly clay based and due to brick
works of long ago there are a lot of very large stones/old bricks below.
The
whole that the tree was planted in took a long time to excavate with pick
axes.

The Maple Tree has been planted in-between two very large Willow Trees.

I do not want to see the tree die. Any ideas on why the leaves are
appearing
scorched and the tree is beginning to look lifeless? Although the leaves
appear to be not drooping, sagging, wilting or falling, just bone dry and
brittle.

Thanks in anticipation

Ron