Hi Andrew,
Sorry I cant help with Christenings etc but the R possibly stands for James Richardson Allon.
On the 1841 Census is Ann Howlett and Husband James and children are living with the Allens/Allons.
Marriage;
Ann ALLEN, Father JAMES
James HOWLETT, married 27 June 1838, Holy Trinity, Kingston upon Hull, Yorks
(IGI Extracted)
1851 census Mary Ann, Widower, says she is born c 1789, Hull, Yorks
I hope someone come up with info for you
