The "Mass Lone Protest" is an intruiging idea which effectively gets round the laws preventing demonstrations in or around London's parliament. In essence, large numbers of people can turn up to make their voices heard providing that, as individuals, they are there to demonstrate against something that equally individually takes their fancy. Thus, 1000 personal protests inadvertantly become a not-a-mass protest of 1000 participants. Confused?
Image a "No 2 ID" gathering. Everybody would support the campaign, but each indivdual would be protesting one particular facet of the legislation and would be a "lone" representative for that "sub-campaign".
The link to Mark Thomas above tells more. The Guardian newspaper describes Mark as "John Pilger with laughs" - good enough for me.