The message
from (Andy Coleman) contains these words:

Hi,

My back garden is approximately 60' x 25' and slopes from front to
back and slighly from left to right. The house is in North London and
as is typical for the area the soil has a clay consistency resulting
in drainage problems.

Someone has advised me that I should dig a hole about 2mx1m by 1m deep
in the lowest point of the garden (which is the bottom right) and fill
it with bricks stones etc. Is this actualy a good option?

Read what cormaic (of urg) says at www.pavingexpert.com...full
explanation and instructions on every kind of drainage solutions,
including your idea, by a professional in terms the layman can follow.

Janet.