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Could be a number of reasons but my two guesses would be either;a) the database is wrong.b) Technical or medical emergency. Curfew or not, I don't think the BAA would be chirlish and say that the aircraft couldn't land for either situations.
And yes, the LHR curfew doesn't apply to diversions or emergencies - I'd guess in this case an operational or maintenance issue, since a medical emergency is almost invariably accompanied by a 7700 squawk.