Although tuberculosis (TB) cases across the country have stabilised, Public Health England says cases in London are continuing to rise at a worrying rate. New figures show 3,426 cases were reported in the capital last year - making up 40% of cases nationally.
The majority of London cases were among people born outside of the UK and many of these were young adults aged between 25 and 44.
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George Michael died in December last year at the age of 53.
PC Keith Palmer, 48, stabbed by Khalid Masood while on duty in the grounds of the Palace of Westminster last Wednesday.
Those gathered on the bridge fell silent at 2.40pm - the time the first call was made to police exactly seven days ago.