Hello Brian :)
Last night I started going page by page through the 1841 census for Maughold then went....duh. I realised they would probably be in Arbory as that was where William was born in 1844. Fortunately I hadn't gone too far. There are three Charles Howlands that I have found so far but none are him...two in Bride and one in Maughold.
In this family there are a lot of much older women marrying younger men but this is a first on the male side.
Mary Ann