I'm not completely clear from what you say but it seems that, before you had the house re-possessed, the creditor must have been to Court & got a County Court Judgement against you. You then didn't comply with the terms of the order & they went back to Court & got the charging order on the house. When the house was repossessed there was not enough equity to pay off the charge.
If the above is the situation, then they can still take enforcement action in relation to the debt. To do so they would have to go back to Court, but they only have to send any notification to your last known address. I assume you haven't told them your present address & don't still get post forwarded from the repossessed one so they could take action without you being aware of it until after the event. I think it's possible they could apply for an attachment of earnings order (but I'm not certain about that).
What I am pretty certain about is that you won't now succeed in going on burying this. If they are at all competent they won't now let it go. You need some good debt advice from a free service, who would need to know about all your debts (if you have others, which you imply you do), your income & outgoings. They could then advise you on your options. These could include coming to an instalment payment arrangement, bankruptcy or a debt relief order (if the total debts are below £15K & other conditions are satisfied). Contact your local CAB or ring CCCS.