Yes, this is correct. I found the marriage on FreeBMD September 1886 quarter (covers period July-Sept) for Birkenhead vol 8a page 719 CANNELL Isabella Harriet E and HOWARD Alfred Howard. You can order this certificate for father's names and occupations.

1861 census has 2 potential "Alfred H Howard" both aged 6 born in Liverpool. One is son of Edward and Isabella living in Everton, the other is a nephew to Thomas Howard in Liverpool. I can send details if you like.