The MMM Register lists the car. Web site and paper versions. Last recorded owner is George Ponder in the USA. I would contact the car sub-register through the LINKS option on this site. The last option is a direct email. A delicate proposition for obvious reasons.
Just found the other thread on this topic. Gene Ponder- Not George as stated. Does not appear to be a posting member. Also problems with email address. This one very much down to the forum. So my point about direct contact is firmly held. All the best.
Yes, Gene was and is a big collector of MGs. He was the one who sold the only NB Airline Coupe back a few years ago for record amounts of money. He is located in Texas and still has a significant collection. He is not on the forum and is not even still a current member of the NAMMMR,