Chris,
Sorry to be pedantic, but from the photos I have seen, they were Drewey 203hp diesels. Class 04. The cab is different for a start.
The Class 03 was the later BR built version, same engine and gearbox, different body. However, Rule 1 etc.
You got me searching through books after that comment Paul.
Where have you seen mention of 04s?
The only photos I've found of small diesel shutters on the Wenford line were 03s and 08s. The 08s were spot on for the clay branch but couldn't fit around the curves at Wadebridge Quay. The 03s were OK on the Quay but underpowered on the branch. 03s used initially unit 08s took over once the Quay fell out of use.
D2127 appears in a few photos:
Bradford Barton B&W book
M&P Bodmin Branches book
The above extracts hopefully show an 03?Not convinced that the two dates are right. If they are D2127 had wasp stripes in 1965 but lost them by 1966....
Searching around the internet has given the following info for the 03s based at St Blazey:
D2127
24/08/1964 arrived St Blazey
14/05/1967 Reallocated to Laira
D2129
07/10/1961 Arrived St Blazey
11/04/1965 Reallocated to Landore
D2183
21/04/1962 Arrived St Blazey
19/05/1962 Reallocated to Laira
08/11/1964 Reallocated to St Blazey
14/05/1967 Reallocated to Taunton
Another shot of D2127 on the branch:
Boscarne Junction. D2127 & brake van special. 10.9.66
Edit: and one of D2127 at the clay dries:
Wenford Bridge Stannon China Clay Works. D2127 & special. 10.9.66