Gillian,(posted 6982 days ago)The short answer is yes. This is because following the execution of a warrant for possession the property can only be sold provided the new owner's solicitors are satisfied that there are no unsatisfied charges appearing on the Charges Register (good title)which they find out by completing (for registered land) Land Searches at HM Land Registry.
However, it should not come to this if you are paying off the arrears as well as paying all regular instalments as and when due. I am not a solicitor and you would be well advised to seek legal help.