Just an aside, my grandfather was born 1881 in the Channel Islands. Just curious as to how John Doran got there, and don't say by boat! My great grandfather was there for work, a bricklayer. My grandfather's siblings were born all over England, depending on where there was work.
I have been through the Latter Day Saints microfilm for the Channel Is. at my local LDS center.
I don't know of any other search on line except www.freebmd.org.uk
but perhaps you could find the marriage on www.familysearch.org