Boris Johnson said: "Londoners have to be a little bit patient; they have to recognise that this thing (the Olympic Stadium) was not built to be the kind of omni-purpose, world class stadium capable of hosting premiership football that it should be and there's a very clear choice for us all.
"Do we want to rush ahead with a reopening or do we want to go on with the adaptations that will deliver a world class facility?"
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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.