I haven't been idle

I have, however, found some more information - but still can't find the possible family connection.
I now know that Philip George Alexander McCree / McRae was born on 16 April 1850, and baptised on 15 July 1850 in the Parish of Stoke Damerel, Devon.
I also know that Philip George Alexander's parents, Mary Ann Howell and Philip McCree were married on 27 September 1847 in the Parish of Stoke Damerel, Devon.
Mary Ann Howell was a widow, and her father was stated to be Richard Williams. Philip's father was stated to be Christopher McCree.
Now I need to find out details of Mary Ann Williams marriage to Howell, and ideally, I would also like to trace details of Christopher McCree, because they might help me find the link to my Mackenzie family.
I know that Philip McCree was born in Scotland, but I can't find him on an 1841 census - but there again, I don't know if he would have been living in Scotland or England.
I'm also presuming that Philip and Mary Ann must have both died sometime between 1861 and 1871, because Philip George Alexander appears in Ullapool on the 1871 census.
Please help me someone
