Nathaniel Okusanya, received a life sentence with a minimum term of 20 years.
Nelson Idiabeta, detained at her majesty's pleasure, received a minimum term 19 years
Passing sentence his honour Judge Marks QC told the two teenagers:
"You have shown not one iota of remorse, both of you seeking to brazen it out in front of a jury."
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Just off Fleet Street stands a famous tiered tower. Designed by Sir Christopher Wren, it became the inspiration for the wedding cake.
The president of the respected Royal Institute of British Architects became the latest high profile figure to enter the row.
The victim, thought to be in his 40s, was attacked in Bromley at around 11:30am. His condition is still unknown.