As the owner or part owner of the house has or is filing for bankruptcy then the house is the responsibility of the Offical Receiver (OR) or a Licensed Insolvency Practitioner(IP) who is the bankrupts "Trustee in Bankruptcy," both these people are appointed by the government to realise the bankrupts assets to pay his/or hers creditors.
When the bankruptcy is formalised control of the house is passed to either the OR or the IP. Which means the estate agent will be in contact with OR or IP to inform them of the current situation with the property.
Quite often a house is jointly owned by a married couple and the house is in both names therefore it is offered to the "other half " to buy their partners share in the house. Otherwise the house is put to auction or put on the market and the money owed to the "other half" is paid to them at a later date.
If the bankrupt is a 'nasty piece of work' it may cause some problems for you in buying it - he may damage the property as he feels what is happening to is wrong, he may also delay you moving in the property if he refuses to move out. There is often alot of court appearence which may also delay matters.
But there are the benefits like you say - a bargin. As at times Trustees just want to get the property off there hands due to over damanding creditors and abusive bankrupts, so wanting to close the case and move on. Finding out the details of the Trustee and possibly contacting him about the house maybe a good idea. The Estate agent maybe able to tell you or as this man sounds like he has been made become bankrupt recently you local Offical Receivers office maybe able to help you contact the Trustee, but you would need the bankrupts full name and possibly alo the court number from his bankruptcy.
For website with infomation on bankruptcy search for - 'The Insolvency Service'