It might be worth noting that where the Farang has been cohabiting, without legally marrying, AND has not bothered to divorce in the UK - it leaves the door open for the former (still) legal wife to make a claim.
Just nominate your current partner, it keeps it simple as long as the nomination is acknowledged. Even if it isn't directly acknowledged, and recorded, by making the nomination it adds weight to Prakhonchai Nick's evidence of proof above.