British army trucks of the 30s. Identification

[Konstantin Chernov]

1) Leyland Terrier. Probably the very first version.
2) Leyland Terrier. Photo from the Internet. This model looks much more impressive. My colleague in automobile history claims that this is a Bull-Terrier.
3) Leyland Terrier from the Vanderveen reference book (1974 edition).
4) Leyland Terrier from the book "British Military Trucks in the Service of the Wehrmacht".
5) Leyland Bull Terrier from the Classic Military Vehicle 2012-04 magazine. According to the author, 120 vehicles of this type were produced.
It remains unclear: which trucks in photos №2, 3 and 4? A late version of the Terrier or a Bull Terrier? Perhaps this question can be answered by "Leyland parts list for chassis no. TSE-5374-5387, model 'Bull-Terrier' " . Unfortunately this book is not publicly available
https://www.iwm.org.uk/collections/i...ect/1500087091