There may not be anything in there to embarass me but there is unequivocally enough in there for someone to steal my identity and ruin a credit rating I've been working extremely hard to build over the last three years.
Childrens names & DoB, previous addresses, employment status, national insurance number. That info alone is enough for someone experienced to do damage.
You can obtain that sort of info, by dumpster diving say, but not in anything like the scale.
Imagine that you can get this info and a pretty good idea of salary and lifestyle by running a db search in a few seconds. You can easily focus your attention on the most lucrative propositions and get info from even those that are careful to not put such info out there. Census completion is a legal requirement, everyone should be on one.