Immigrationboards.com

I came in the country in 2001, but I have just realised my very first passport, which has my 2001 entry stamp inside, is gone missing, been searching everywhere, but still can not find it, will i be able to apply ILR using other form of proof e.g. school letter proving i was in UK at that time or be able to obtain the record from the home office ?
thank you very much
regards
lawerence

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