I spent 15 years trying to find my great great grandfather - with the release of the 1939 register, I am 99.9% confident that I have located him. Very common name, left South Wales and ended up in London. The single family story I was told by a distant relative has proven correct (however improbable it sounded). I am very doubtful that a professional genealogist could have located him prior to this as the only thing I had to go on was that he died in London and was buried in a paupers grave. William John Hughes from South Wales just didn't want to be found!!!!
I've spent the last few weeks writing and e-mailing random people in the hope that they are his children from his second marriage (no luck yet, but I am hopeful).
Once I confirm him, it's just his errant father that I need to find. I have a 20 year period to cover, another common name, and no idea where he died!!!
Luckily, people on here are fantastic. The service this site provides is worth so much more than any service you could pay for. I've found cousins on here simply because I've put a relatives name in the thread and they've googled the name at a later date.
It was brilliant - my cousin worked for a firm of solicitors that I used through work. I recognised her name, but couldn't place it.......until I looked at her firm's mousemat sat on my desk