With respect to the above post regarding the questions. legally speaking a IVA is a individual agreement and does not have to be declared to anyone even if they ask it is none of there business. And bankruptcy does not need to be declared once it is removed from your credit file unless there are terms imposed under your judgement.
All of which do however have to be disclosed if employed within some fields. Don't answer the questions correctly and you forfeit the job.
Just as for spent convictions, there are still a numbers of jobs excluded for the general requirements to which you refer.