The message
from "Martin Sykes" contains
these words:

Would there be a problem with contamination from the foundations which might
damage the tree through chemical rather than physical means?

Camellias (IIRC) like an acidic soil. The foundations might tend to make
it more alkaline, though not a lot.

You could put down some gypsum (calcium sulphate), acid peat or other
sulphates if it shows any signs of distress in the future.

--
Rusty Hinge http://www.users.zetnet.co.uk/hi-fi/tqt.htm

Dark thoughts about the Wumpus concerto played with piano,
iron bar and two sledge hammers. (Wumpus, 15/11/03)