The London Assembly is due to vote this afternoon over the Mayor's plans for affordable housing. Members are currently debating how much landlords can charge tenants across the capital.
The changes would mean that rent on new affordable housing is fixed at 80% of the market rate. Critics say that would make some new properties for people on low and modest incomes unaffordable.
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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.