RootsChat has a policy of not naming living, or potentially living, people.
So unless all the people concerned are deceased, there's not much we can tell you

If you use FreeBMD.org.uk, for a marriage of john Gourlay in 1946, then click on the highlighted page number, you will be able to find his wife's name.
Again on FreeBMD if you look for Gourlay births, mother's maiden name Newbrook, there are 8 births in the Whitchurch Registration District between 1949 and 1964