Does this help?
Supreme Court Act 1981c. 54, Part V: Powers of court in relation to personal representatives, Section 116: Power of court to pass over prior claims to grant.
We did one where there was knowledge of a child but she could not be found initially, and when she was, wouldn't respond as relationship was soured to say the least. Grant was issued to Solicitor to call in the assets whereupon on information money was waiting she did miraculously respond.