Thanks Sandra, more excellent digging.
Disappointingly the Scottish birth record is for June 30th 1891 5hrs 50mins (that implies a twin but the preceding birth record is on another page) to Alexander Caldwell, fireman, and Isabella Caldwell m/s (maiden surname?) Brown married April 23rd 1895 at Barrhead.
So wrong Caldwells - and wrong child - pity.
And discovered that on Scotland's People, each record seems to cost 6 credits - annoying.