Brian gives alternative wives for that marriage. Did you read his notes? If you buy the cert giving the details he has recorded for the groom, you will get full information about both bride and groom.

There is a Maughold marriage recorded in 1878 for Welles Surplice, to Agnes Jane WHITE, where he is given as a Gentleman, of Ballure Cottage, with father Saml Herrick Surplic, Estate Agent. Could be a first marriage, or a relative of the 1915 one.

Sue