As the refusal letter of the context question states, the papers were decided to be a false representation because they are either(among other reasons) probably
- used by an imposter [as in: he is not the person the papers claim to be]
- hashave been obtained fraudulently [as in: the information given to the issuing country were not correct]
The UK authorities reasoned, basing on the data they have, that yourthe OP's statements to the visa issuing office were wrong. They determined (most likely because of the different birthdate and name, but matching other data they have) that as a result the papers must either belong to somebody else (worded as imposter in the denial and in the statute as relate to someone else) or were obtained fraudulentlyobtained fraudulently (wording in the denial, in the statute this is obtained improperly).
Possession of such ID papers (including passports) without reasonable excuse is a crime under the Identity Documents Act 2010, s.6 b & cIdentity Documents Act 2010, s.6 b & c:
It is an offence for a person (“P”), without reasonable excuse, to have in P's possession or under P's control—
(b)an identity document that was improperly obtained,
(c)an identity document that relates to someone else,
and s7This does not only mean identity documents issued by the UK, but also any other countries or their replacements as, s7 describes:
(1)For the purposes of sections 4 to 6 “identity document” means any document that is or purports to be—
(c)a passport issued by or on behalf of the authorities of a country or territory outside the United Kingdom or by or on behalf of an international organisation,
(d)a document that can be used (in some or all circumstances) instead of a passport,
As such, theThe possession of thesecondary papers under a fake namefake name for a state that does not offer dual citizenshipdoes not offer dual citizenship but not having not repealed the onecitizenship of another country that was held before makesimmediately triggered the Visa Office's response that the second papers must be improperly obtained or belonging to somebody else, which is a crime punishable with up to 2 years in the UK, as Section 7 C explicitly says "passport issued by a country outside of the UK". There might be a reasonable excuse that would prevent such a punishment, but the IDA 2010 does not contain what might be such.