I spotted this protest on the 'A Reluctant Sinner' blog. The plight of Christians in Pakistan is dreadful. Recalling the sacrifice of Shabbaz Bhatti the event deserves as much publicity as possible.
'Googling' the event under 'News' came up with only two entries. One from Independent Catholic News, the other from 'Aid to the Church in Need'.
No doubt the Church of England is busy navel gazing on what they would regard as more important, secular matters, eg, here and here.
A report of the march from the Pakistan Christian Post can be found here.