Just as important, we want to preserve our garden space in its green, leafy and flowering form. In particular we want trees to grow and thrive and they simply can't do that in thin soil that's principal purpose is to cover over a dwelling space.
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Paramedics were on standby outside the police cordon as armed officers stood by the property.
A team of researchers has taken samples from the ten busiest London Underground lines to work out which are the dirtiest.
The action comes on top of an emergency timetable which has seen hundreds of trains a day being axed.