further evidence required flr (o)

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Hello everyone,
I have just received a letter requesting for further documents from a caseworker. As I applied under the category of parent of a British child, I am not sure why I was asked to provide evidence of life and language in the uk test. Am under the impression this is the requirement for ilr applicants. Any suggestions on what to do next would be appreciated.
Evidence required by Friday the 4th of April.