Greetings Valerie,
I am very surprised to find out that David DINGWALL, MP, considers himself an Island DINGWALL. Since you lived near him, do you still maintain contact? I have done extensive research on the PEI DINGWELLS, and did not believe that David was closely related, that is any more so, in that all the DINGWELL/DINGWALLS are related somewhere.
You may contact me at; funderha at auracom dot com.
Must keep rooting,
TINY