Major points in the article and blog:
1) The number of Muslims has increased substantially in 10 years
2) Britain has the third largest number of Muslims in Europe, but the 9th largest proportionally
3) A tendency for Islamic families to be larger will lead to a higher proportion of Muslims in the country in the future
4) At some point the Muslims will seek to be better represented in parliament thus opening up ground for Sharia law to become central and a Muslim lobby to be created.
Points 1, 2 and 3, are fairly reasonable but not worrying in themselves. Point 4 I cannot accept, because first of all the judiciary and the government are separate and given the historical background of the legal system I can't see Sharia law becoming widespread (also it wasn't commented that Sharia law is already in place in some places operating in civil legal cases). As for the notion of an Islamic lobby, well I disagree with an lobbying groups, unlike America lobbying is not so widespread here. Instead there are representative groups, and there are two large Islamic representative groups already, but we've not seen any significant change.
Storm in a teacup I feel.