Hi Dave,
I double checked my Hants Baptism CD but this time just searching on Dig*:-
8 Nov 1679 Richard Diggwood s/o Richard
23 Jul 1682 Richard Digweed s/o Richard & Elizabeth (There is a William Digweed s/o Richard baptised 16 Oct 1682, so with this being only 3 months after the above Richard's baptisms, it would indicate that there is more than one Richard Digweed/Diggwood 'operating' in Burghclere at the time. Sorry to muddy the waters!).
I looked for marriages again searching on Dig*:-
Burghclere 31 Oct 1674 Richard Digweed & Winifrith Wither
" 15 May 1735 Richard Digweed & Mary Bastin
nothing for a Richard & Elizabeth.
Things this early are always difficult to prove but, if it were me, I'd say that the Richard who married Jane in Thatcham would have returned to Burghclere if that was his home. I'd kick the Thatcham Richard into the long grass! I never go by Ancestry trees anyway!
Unfortunately, I don't have any Hants Burial Cds so I can't check if either of the Burghclere Richards died in childhood. However, guess what I found on the Berks Burial CD in Thatcham? Buried 7 March 1673/4 Richard Digweed s/o Thomas!
So, very helpfully, I've got rid of one alternative for you - but provided you with another! Oh dear!

Have you tried looking for wills?
Jill