A letter seen by ITV News shows that HSBC has given notice that it will close the bank account of Finsbury Park mosque because it "now falls outside of our risk appetite".
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They say Great Ormond Street Hospital has denied their request and the baby's life-support will be switched off on Friday.
He is accused of raudulently attempting to gain money and housing by pretending he had lost family members.
The High Court made the ruling after hearing an application by the Association of British Commuters for a judicial review.