Try the St Helena forum, this is from their website:
"This is the St Helena Institute's 'Forum for Family History'.
It is intended for anyone interested in St Helena family history and genealogy (incl. Ascension Island and Tristan da Cunha).
As this forum is both a Message Board and a Mailing List, your message will be accessible online to future members and visitors to this site.
Posts to the group should feature one of the names being researched in the subject line, if applicable.
Please note that all posts require the approval of the moderator (Dr A.H. Schulenburg).
Basic resources relating to St Helena family history can be found on the Institute's homepage at
http://www.st-helena.org.
So if you contact the e mail address hopefully they will be able to help
Regards
Eveline