Sorry Derek, got that all wrong. I don't know if you are in contact with a person researching this family from michigan called kbtonkin, I have forwarded your email address but you can email him yourself via kbtonkin with the following @excite.com (trying to avoid spam!)
Dora Martin was born between Jan and March 1898 in the St Austell District volume 5c pg89 looks like she may have had a twin called Charles Martin as they were registered around the same time. If I come across anything else I will get in touch. Best wishes,
Sarah