UK Assistance in Obtaining Travel Documents for minor

need someone to help me and my wife, find a way to allow our son to leave the UK and fly to Spain. He currently is in London with my wife, and I have moved to Spain to work. They cant join because he does not have a passport. Let me explain: We moved to the UK (Scotland) in June 2012, he was born in Aberdeen on November 2012. I hold an Italian passport and my wife a honduran passport. In order for him to have a passport we have to register our marriage and his birth in the Italian embassy in London, we have been unable to do this as we made a mistake with the paperwork and everything has stopped, the Embassy is not replying our emails or answering the phone and there are no appointments available until december. I need help in finding out if the UK government can help us by producing some sort of ID document that will allow him to leave the UK and enter Spain.