Lib Vas 1606 intacks chief rent 2s) John Corkill 12d drawn Willm Corkill entered 'for that he is the eldest sonne of Jo Corkill decd'
Patricles John Corkill drawn - William Corkill entered in his place along with Ric Kermott

so that sorts out John to Wm
but not Wm to Wm which I've not yet found (has to be post 1643 and before 1691 as Wm Corkill of the 1643 composition was dead by then (and looks as tho Wm junr was born post 1643 otherwise surely Wm senr would have named him as a life in composition)

next message will look at wills + presentments