Hi Michael, sorry, the NBI is the National Burial Index, very useful so far as it goes but there isn't full coverage either of dates or places, a new version is just out however.
I've been looking at the One World Tree (granted not that reliable) and the couple of entries that include Edward Henry Bowman have his wife as Phoebe Hovells, FreeBMD however has an entry DecQ1854 Newcastle Upon Tyne which includes Edward Henry Bowman and Phoebe Burns, could she be a Phoebe Hovells Burns*, i.e. possibly Phoebe's niece or did your Phoebe knock 15 years off her age?
* She's Phoebe Hovells Burns bap 26 Dec 1836, All Saints, Newcastle daughter of John Burns & Ann