I believe there are some Premium bonds registered in my name however these were left with my dad when my parents separated and we are no longer in contact with him. Is there anyway of checking if I've won without the bond number? Thanks.
NSI have a tracing service whereby you can attempt to trace any investment in your name.
So the first step is to do this - once they have determined that you HAVE premium bonds, it's a simple matter to track if you have one a prize.
If you dig into the website In a Pickle gives there is a tracing request form. The holder's number box can be filled in 'don't know' and it doesn't ask for bond numbers.