You might try contacting the individuals owning N540BD, N1080V and N82696. My photos of these BULLDOGS are on this site and all are still on the FAA register. Go to www.faa.gov to access registered owner names, addresses, etc.
Pardon the delay in answering, but I just now saw your inquiry. One of my photographed Scottish Aviation BULLDOGS is no longer on the registry-N9206F, deregistered in 2008 after I photographed it at EAA AirVenture Oshkosh the same year.