Going off at a tangent a bit, on what basis is she recieving IS now? If its on sickness grounds (due to her learning difficulty) there'd be no point in claiming IB anyway. On the original subject, if she's on IS already on other grounds it's hard to see why they're insisting on ID in order for her to make a sickness-based claim (which presumably will be for credits and eventual DP only). Plus, her GP will need to issue med certs which seems pretty convincing evidence that she's who she says she is and not her sister.
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