In the last month over 44,000 bus passengers a day have used the 'One More Journey' feature introduced to ease the transition of buses going cash free.
It allows users to make one more journey should they not have enough credit on their Oyster card or if their travel card or pass has just expired.
Of those passengers, over 80% have topped up before making a further journey. As a result of this, cash fares dropped and so were only used for 0.7% cent of all journeys on London buses.
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The plaque at number 16 Cowley Street in Westminster marks the brown brick Georgian townhouse where Sir John lived for 31 years.
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Metropolitan Police officer, Tom Harrison, has been crawling the course since the race began on Sunday morning.