The theme of this year's National Consumer Week is 'cold calling - don't buy it!'
The Trading Standards Institute is calling on people to get tough on cold calling which it says is not in decline and vulnerable people are being targeted.
It has created stickers to put on your door to tell rogue traders to go away. If they refuse to go away it then becomes a criminal offence. People are then encouraged to phone the police.
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Officers were given the touching letter at Brixton Station while they were on a reassurance patrol after yesterday's attack
The 52-year-old had previous convictions for violence but was not on the anti-terror watchlist.
In a statement Charlton Athletic said: Keith was a true hero who will be greatly missed by all the Charlton family and everyone at the club.