I did this survey a few months back on behalf of an elderly relative who was ill. I was actually baby-sitting the house as the front door had just been painted and it was open to dry. The survey guy had knocked on the door before and a niece was a bit dubious about the survey. It was no big deal, just questions about income, spending, savings, lifestyle, housing etc etc. He just had a list of random house numbers that he had to survey on his laptop and submit to the CSO in Cork.