Thanks for your advice David, much appreciated.
Just one other thing, quite a lot of the leaves at the beginning of summer
had a lot of small black spots on them, turned pale yellow and fell off,
they now all seem fine, just wondering if this is down to any deficiency in
the soil etc?


"David Hill" wrote in message
...
Root pruning can be carried out several ways.see ........
http://www.rhs.org.uk/advice/profile...ot_pruning.asp

I would use a spade around the edge of your borders, then if you hit large
roots then dig and cut.
I wouldn't do the recommended 4 ft from the trunk with a tree of that
size,
also if you find a lot of large roots then do some each year, over about 3
yrs or so.


--
David Hill
Abacus nurseries
www.abacus-nurseries.co.uk