B964120 1970s colour:
http://www.rail-online.co.uk/p265322570/h17c862c2#h17c862c2
A search for "brake tender" finds a few more, including this cracker:
http://www.rail-online.co.uk/p766079789/h9d3a5fc#h9d3a5fc
Also:
A number in store (?) at Adsley shed and a straight sided/LMS bogied one (I think?) in this Blurb book preview:
http://www.blurb.com/books/980708-on-further-reflection
About page 7 or thereabouts.
From this page:
http://fullsun.webplus.net/page9.html
Photographer (Keith Sanders) also has this Flickr site, so may be willing to upload pics on there:
https://www.flickr.com/photos/railcam
He is on the scot-rail.co.uk forum as well.