5.—(1) This paragraph applies to a simple procedure case where the claimant has used an arrestment to found jurisdiction before the Claim Form is formally served on the respondent.
(2) The service of the arrestment must be reported to the sheriff clerk as soon as possible.
(3) The arrestment ceases to have effect unless the Claim Form is formally served on the respondent within 21 days from the date of formal service of the arrestment.