Nick Brooks wrote:
Hi all

I'd like to replace the water main to the house. The water company have
asked for a trench 750mm deep lined with pea-gravel or similar do be dug
from teh house to the road.

The biggest problem is that the trench will have to go through/under the
garden wall which is a 120 year old dry stone construction which may
well not cope well.

Dig a trench up to the wall, a bit bigger hole next to the wall, that
you can get in, and then use a pickaxe, or trowel to cut a hole for
the pipe.
Vacuum cleaner may be hany on sandy soils.