At this stage it is more or less a standard requirement for all Europe financial institutions. The companies, such as the one you mention, usually cover some or all of the following:
- Police check (in some countries you have to agree to it)
- Credit check
- Scan of public documents
- Scan of paper clippings
- Some recent service offerings I've seen include social media analysis
It is hard to say what is best approach, if it is in the public records it is likely to be picked up at some point either now or during a recheck later on. I'd be inclined to disclose it and hope to argue mitigating circumstances, rather than having them discover it themselves. Because then you are gone for sure.