"Surely this [11 people inside a polling station] is illegal, and should have been stopped immediately and the people concerned arrested? "
Quite so, ludwig. Each polling station in TH had a police officer on duty but nothing was done (incidentally I have not seen a police officer at my local polling station for at least 20 years).
I don't think chillidoubt's reference to Enoch Powell was anything to do with a council being in the charge of independent councillors (though I may be wrong). Unlike sp1814 I unfortunately have to travel through Tower Hamlets and Newham from time to time. Although the demographic figures show that those of an Asian descent are in the minority you would never think so. In quite a few parts of those boroughs you are lucky to see a white person at all. As far as I know there has never been widespread suspicions of vote rigging or disorder at polling stations in the UK. Until recently, that is. This report by the Electoral Commission lays out its findings into an earlier accusation of vote rigging in TH:
http://www.electoralcommission.org.uk/__data/assets/pdf_file/0019/154531/Tower-Hamlets-report-2013.pdf
Paragraphs 2.8 to 2.11 give details of alleged postal vote fraud.
This article also explains earlier concerns the Electoral commission had about voting irregularities in other areas of the country.
http://news.sky.com/story/1191986/probe-into-south-asian-vote-rigging-claims
Among the salient points:
"An investigation has been launched into concerns Pakistani and Bangladeshi communities are more prone to vote-rigging. The Electoral Commission said differences in "cultural approaches to democratic participation" were not acceptable excuses for electoral fraud.
And while it emphasised that corruption was not confined to South Asian communities, it admits it is such a concern that further investigation should be carried out."
It is interesting to note that the irregularities seem to stem from "differences in cultural approaches to democratic participation". Certainly when viewing the scenes on the telly showing the streets of Tower Hamlets outside the Town Hall where counting was taking under way I saw no white people at all, no women at all. All the participants were Asian males. Their behaviour was not very agreeeable.
Tower Hamlets and neighbouring Newham are not pleasant places for non-Asian people to live. (In fact, they cannot be that pleasant for Asian people). Driving through them on a Friday afternoon after "Friday Prayers" have chucked out is extremely unpleasant. Give it a try - around 2 to 2:30pm - to see what I mean. The streets are full of young Asian males milling about and the atmosphere is very intimidating. There are not a few isolated individuals, there are hundreds of them. If you happen to drive near to them as they spill into the road you need to hope you don't catch the traffic lights. These people have no intention of integrating with the rest of the population and are instead intent on living their own lifestyles more reminiscent of those in their "homelands". This should not extend to vote rigging or intimidation at polling stations and the authorities need to get a grip on the problem urgently. If it is tolerated it will develop in the same was as the sermons in the road outside Finsbury Park mosque did.