If you have been contacted by a High Court Enforcement Officer, it means that one of your creditors has been through court process to recover a debt. In Scotland, High Court Enforcement Officers are called Sheriff Officers or Messengers-at-Arms. They may also be known as Judicial Officers, and they all have power to take enforcement action against you.
You should not simply ignore contact from a Sheriff Officer or Messenger-at-Arms. You will need to come to an arrangement to pay the amount owing in full, dispute the debt, or negotiate an instalment plan. Otherwise, enforcement action will be taken against you to take control of goods to the value of the debt.