What a scam. Report them to the UK police.
It is the duty of the executor to search for all beneficiary. If your Aunt died intestate, and had NO children, or surviving children from her own deceased kids, then you may be a beneficiary if your related parent has passed - otherwise forget it.
No percentage fee is ever paid - that is illegal. If the executor has failed to find you, they are in the wrong and can be sued.
I have way too much experience in this
