Thanks very much to everyone for your ideas, and thanks to Bee for looking at the churchyard. I did visiit and take some photos, but drew a complete blank at every churchyard where I did look for graves!
My head's now spinning with it all and the dining table covered with my notes which all need assimilating!
But it doesn't appear as if my Cavill family originated in the area - or at least not as far as the Eastrington and Howden PR's are concerned. I have discovered since the 1841 came online that my earliest Cavill, George, was not born in Yorks, so I'm pursuing Lincolnshire as a possible origin.
George was mis-indexed as Carile so it was one of my kind contacts who found him for me, which leads me on to a little challenge if any of you fancy a go - where is George's son John in 1841? John Cavill was a corn miller, or employed by a corn miller. Born 1789, married Frances/Fanny in Howden in 1819 when he was living in near Market Weighton, sons George (1825) and James (1831). Both sons born in Sutton on Hull/Sutton in Holderness. In 1851 John, Fanny & James are in Sutton so I would have expected them to be there in 1841 but no sign - I've been through all the pages. By 1861/71 John & Fanny are in Snaith/Cowick area (mis-indexed as Cavert!).
Any ideas?
Thanks
Diana
Nick, I may well take you up on the offer of putting any questions to your cousin in Snaith - when I have a chance to work out what to ask!