The June/July 1992 edition of Modellers’ Back Track, of which I have a copy, contains a short article, including photos and drawings of the Aspinall ‘A’ class (Class 27), rather than the earlier Barton-Wright design. As stated in the Drawings Index in the Members’ Area.
You could turn to ‘L&YR Locomotives’ pp31-35, written, like the MBT article, by Barry Lane. This contains both drawings and photographs, including tender detail differences with variations according to the original builder, whether the L&Y Miles Platting works or private firms such as Sharp Stewart, Vulcan, Kitson or Beyer Peacock.
If you’d like to take a look you can contact me using the contact details given in the IFC of the Newsletter.