She should start by telling her fellow cabinet members this:
Tagged: muslims in britain Toggle Comment Threads | Keyboard Shortcuts
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The Department for Communities and Local Government has produced a series of reports into Muslim ethnic communities in Britain. Lots of numbers, charts, etc for those interested.
You can read the summary, or take a look at the detailed reports for 13 different ethnic groups communities. From a quick skim the reports go to great lengths to provide a detailed fingerprint of Muslim ethnic groups (they even list madhab affiliations).