And the next installment......
Courtesy Bucks FHS marriage index I have found the marriage of John HEAD and Joanna COLES in Grendon Underwood - 29 Feb 1808.
It doesn't add much to the story but does give an interesting thought - did Joanna (pregnant at the time with their 6th child) use the old tradition of a leap year proposal to persuade the old chap (he was 63 at the time) to finally marry her? Nice idea.
Next step on the Bucks end is to track down a load of burials - especially of his first wife, Judith (if this was in 1807/8 it would offer an alternative reason for the tardy marriage).
At the Berks end it's pretty basic stuff - the Chieveley PRs seem to take me back to the early C17th with a good chance that the next link is in Peasemore in 1570. One advantage of farming ancestry is that they don't move around much because the land ties them to the place. However, I'm not over-confident that I have got it right, it looks good from the PRs - but there are a lot other HEADs around to get mixed up with.
The trouble with finding several generations in a PR in virtually no time is that it is too easy to just plonk them in the tree and miss out on the opportunities to add some substance to your knowledge of them. So I need to check back at wills, tax records, polling records etc. to see what else I can find out - which will take a lot longer than it did to find them.
And I definitely need to bury them all (which may totally mess it up if I find some child burial when I have calculated that child was the father of a later generation). Of course to bury them I have to sort out the other lines to make sure I am not burying someone else's ancestor - I'll be in touch MattD30 (was the Widow HEAD buried in Chieveley in 1663 my Sibill?). Of course I also need find all the marriages to account for the female HEADs and to open up new lines of ancestors - irritatingly almost none of the marriages seem to have made it into the Berks or North Berks Marriage Indexes yet

Impossible to do completely of course - there are always some who manage to avoid being recorded or disappear across 3 or 4 counties to marry (in a parish not covered by the IGI of course).
Lots to do - it may be some time before the next installment!
To close with a query - one marriage that has been indexed is that of Thomas NORCROFT to Ann HEAD at Besselsleigh in 1728 - both are shown as being from Leckhampstead. Almost every marriage in that period is shown as being by licence and few of the happy couples include anyone from Besselsleigh - was this the eloper's destination of choice for west Berkshire?