Children at primary schools across London have been growing their own fruit and vegetables as part of an initiative run by the charity School Food Matters.
By growing food from seed, it helps teach the children where food comes from - the ground, not the supermarket!
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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.