So is mine but it's so much hassle to get it changed I gave up and it's never been a problem.
The correct way would be to write in sending a copy of your birth or marriage certificate.
http://service.o2.co.uk/IQ/SRVS/CGI-BIN/WEBCGI.EXE?New,Kb=Companion,question=ref(User):str(HomePhone...
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