http://www.multimap.com/map/browse.cgi?client=public&GridE=-3.06490&GridN=55.62400&lon=-3.06490&lat=55.62400&place=Innerleithen%2C%20Scottish%20Borders&db=freegaz&scale=100000&search_result=Innerleithen%2C%20Scottish%20Borders&lang=&db=freegaz&keepicon=true

come off the A72, head south for about 500m, across the bridge and you'll see the site on your left.  with the big hill in front of it.

Dead easy to find.

its pretty much just under the N of innerleithen on the way to traquair