I have been asked to reply.
The Insolvency Service publish quarterly statistics of bankruptcy orders and IVAs, available here: http://www.insolvency.gov.uk/otherinformation/statistics/insolv.htm. These statistics are not currently available broken down into the main reasons leading to the insolvency. Bankruptcy Orders (only) will be analysed by broad causes of failure for new cases from October 2006, but these will not be detailed enough to identify “delays in receiving benefit” separately within the broader category of “loss/significant reduction of income”.
There is currently no such information available centrally for individual voluntary arrangements.