Need some advice on interim charge notice if possible?

My son received a letter from Drydens solicitors regarding an interim charge notice on a house he inherited from his late father.  His dad must have had a loan with Natwest secured on it from 2014, but he passed away in 2017.  We were only made aware of this last year and we believed we might have to pay these costs upon sale completion.  However, it is an  interim order and not made final and the title was successfully transferred to my son in 2023 with no issues.   We are just in the process of putting the house up for sale and need some advice if he is liable to pay this.  If anyone could advise, I would really appreciate it - thank you!

Jennifer - it's legal advice you need here as whilst this is a public forum you are very unlikely to get anyone responding to your thread other than HMLR ourselves.<br> You should try forums such as Money Saving Expert where issues re charging orders/debts are often aired and discussed<br> From a registration perspective if the charging order has been protected by on the register it won't be as a secured loan (mortgage) -&#160;<a href="https://www.gov.uk/government/publications/charging-orders/practice-guide-76-charging-orders">Practice guide 76: charging orders - GOV.UK</a>