In investigating the my ancestor Mary Whitehead (bapt 1779) I discovered her mother was Mary Grigsby. Although she didn't appear to be from Stockbury I looked for other Grigsbys in Stockbury and Bredgar - and found some. The combination of names of likely siblings etc. together with data on IGI, confirmed / corrected and extended by data transcribed on KFHS CD 25 has enabled me to quickly trace this line back to Guy Grigsby, bapt in Marden in 1565, son of John. As PRs only start there in 1558 I don't expect to be able to get this line back much if any further (though it looks as though John may have left a will).