Hello all. I am surprised to see this old thread revived.
Thank you for the offer of help Daniel.
Unfortunately the person who may have a claim I don't think is interested in pursuing this.
The "heir presumptive" I believe might be a cousin of his, however it is difficult to get information from the possible claimant as I am relying on other people to pass on my questions, and the possible claimant knows very little about any of his family (possibly not even who his cousins are).
The possible claimant's father died last year and there were conflicts over the will so he has been preoccupied with solicitors etc.
Daniel, I am still curious to know if this person does have a claim, so depending on what information I need in order that you may be able to advise me, perhaps we could correspond via PM.
Thank you all again.