Thanks David for the input & extra ( & expert) Beds knowledge.
As you say, it's just conjecture, but I have a list of coincidences, plus vague family connections to some Scots-Irish in Beds, (see Stonestown, Ireland ), plus an early Armstrong who wed Christian Fiddes in Wilstead. (The only girl I've found of the name was from Jedburgh, & the age fits).
Unfortunately, none of this is proof positive, but my DNA links to some people from the Borders in the 1400's (+/-) is useful.
If you uncover anything in your researching travels, I'd welcome any input.
Cheers,
Bob