Hi Allstar
I have also been looking for John Tambling's marriage to Jane... with no luck.
I see John in 1841 with his parents and sister.
Janes birth place varies:
1881 = Looe
1871 = Pelynt
1861 and 1851 = Talland
i have been searching 1841 for Janes from those areas and trying to find their marriages ...no luck yet!
I think that in order for you to research jane's family you may also need to invest in a birth cert of one of their children.

deb