There is, potentially, another avenue to try...
How about trying an argument analagous to one tried in CG/1479/1999? In short, that the LA's decision making on the original claim was premature (as they failed to allows a "reasonable" time for the evidence to be provided) and, therefore, an error. In turn, that decision is subject to an "anytime revision".
It may even be worth putting an appeal in, even if late, arguing that the LA's decision was unreasonable (this would be separate to the discretionary "anytime revision" avenue).
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