If you are a home owner and have unsecured debts, in theory these creditors have no claim on your property. However I believe that more and more creditors (especially credit card companies) are seeking to secure their debts using charging orders. This is because if you have problems repaying, the creditors start to worry that they are going to lose out if you press ahead with an IVA or even bankrutpcy.
As Sovereign says, a creditor can not apply for a charging unless they have first issued a count court judgement (CCJ) which has hen not been paid. As such, if you receive a CCJ admission form it is vital to properly complete this with a suggest monthly repayment amount that you can afford.
It is also important to add that even if you do receive a charging order, it is extremely unlikely that the creditor will be able to force you to sell your house. The court will generally not allow that. However, the creditor is allowed to add statutory interst of 8% a year so it is always best to try and get the debt repaid as soon as possible.