The web page is http://www.nls.uk/maps/ . He found the people extremely helpful and willing to help him to find the map he needed. It was an 1869 Argyllshire map. They scanned it and then burned it onto a CD (a TIF format - high quality), for a nominal cost of £7 (approx $14). He highly recommends this service to anyone searching Scottish ancestors, as often the town names over the years, change name, spelling or disappear all together (the later was his issue). He hopes this helps someone.
It is a very impressive, organized and extensive repository of maps.