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Open Rights Group chief Jim Killock, pictured here with Liberal Democrat prospective parliamentary candidate Bridget Fox, told ZDNet UK he estimated around 250 people showed up for the demonstration.
Asked whether he thought the protest would make a difference, Killock said demonstrations were "part of change".
"I think the more than 13,000 letters sent to MPs [complaining about the bill's fast passage through the Commons] ought to make a difference," Killock said.
Referring to the second Commons reading of the Digital Economy Bill on 6 April — the day when the date of the general election is expected to be announced — Labour MP John Grogan said it was "an absolute insult to our democracy that we will be discussing such a bill in such circumstances".
The MP for Selby said it was "absolutely essential" that the bill be subject to full Commons scrutiny, adding that "the controversial sections of this bill must be dropped for a future parliament".
Tom Watson, the MP for West Bromwich East, told protestors the Digital Economy Bill was one of the most complex he had seen in his nine years in parliament.
He said the fast-tracking of the bill through the Commons would be "nothing short of a constitutional impropriety", and protestors "have to campaign to stop it".
"Whatever your views on copyright reform, it is simply unacceptable that the elected chamber of the House of Commons does not have the time to debate this," Watson said.
The Labour MP also voiced criticism of a provision — which will be replaced or altered by the government — that would lead to website blocking at the request of rights holders. "Blocking websites — they do it in China; we should not be doing it in the United Kingdom," he said.
ZDNet UK later asked Watson whether he thought the protest would make a difference. "It will make it harder for the bill to be bounced through," he replied. "Some MPs are deeply troubled about the fact that this could be bounced through in 90 minutes."
Watson added that the letter-writing campaign against the bill had led many MPs — six on Wednesday alone — to ask him what their constituents were complaining about.