I can't remember in exactly which post I mentioned it, but I applauded Anne Cryer (who was castigated for speaking the truth) and mentioned the problem in Keighley. It was known well before 2003, in the '90s to my knowledge - as was the habit of the 'elders' going around houses at election times and pointing-out where to put a cross on postal votes, before collecting the ballot-papers. Yes, I was told that as if it were an accepted normality, by a Pakistani teenager. Yes, I did pass it on. I'm not a Labour voter, but Anne Cryer was a brave and good M.P.. Like Ray Hunniford, she suffered for speaking the truth.
The reason is that non-Muslims are not considered as worthy of respect.