Boris Johnson was accused today of promoting cycling "to boost his ego", after an angered taxi driver called in during a radio phone-in show with the London Mayor.
Bill told Mr Johnson: "The more these bikes you put on these roads, the more deaths you will have".
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A man who met PC Keith Palmer said his murder "sent a shiver down my spine".
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.