Hi Matthew,
I together with other Hancocks have been researching the Hancocks of South Warwickshire in a one name study and we produce a regular newsletter (about three a year) for those researching the Hancocks of South Warwickshire and nearby parishes. . We also have information on the Hancocks of Northamptonshire, mainly in the South of the County.. The oldest West Haddon Hancock we have found is Jacob Hancock (wikiref - 1328) born about 1730.
I have a family tree for the Hancocks of West Haddon which has been derived from original parish records and census information, both now available on Ancestry.com. This is however at variance with the birthplaces of many of these West Haddon Hancocks shown on Wikitree which show birth places well away from the parish where baptisms in the parish are already known. If you wish, I can let you have a copy of the tree and you can tidy up Wikitree or I can do this on your behalf.
What is your interest in the Hancocks of West Haddon?
best regards
Roger Hancock