My pension provider is asking me to provide a copy of my marriage certificate and birth cert in respect of my pension. Can I use the church certificate given to me over 40 years ago or do I need to get an official one from somewhere? Can I use the "short" version of my birth certificate or do I have to have the "long" cert version? I am based in Dublin. Can both of these items be purchased online and are they both available from Lombard Street if I call in?