That's not what the Guardian says in its first paragrah on the story..................
"The Muslim population of England and Wales is growing faster than the overall population, with a higher proportion of children and a lower ratio of elderly people, according to an analysis of official data. One in three Muslims is under 15, compared with fewer than one in five overall. There are also fewer elderly Muslims, with 4% aged over 65, compared with 16% of the overall population."
When Songs of Praise started in the 50s there was less than 50k Muslims in the UK, so since then the "gap" has only been going one way.....................
They are saying that part of the percentage growth is due to less muslim elderly deaths than the overall elderly population. This is obvious. In the same way many xenophobes will die over the next few years and hopefully leave us a better society.