If you in the UK less than 2 years the DVLA can sign your Photo unless you know a person in a postion stated who knew you in phill or somehow i guess.
http://www.direct.gov.uk/en/Motoring...ence/DG_078281
this is mentioned at the bottom
Your nearest DVLA local office staff can help if you have no one to sign your photo, if you have become a resident or returned to the UK within the last two years. They'll sign your photo and complete section seven of the application form.
Your application and original identity documents are then sent to DVLA Swansea for further authentication