Mk.I Serials fitted with Rotol

per Vickers 339 27/3/40
“Mod 124 (mod landing lamp control)… to suit the incorporation of the Rotol airscrew control. This mod is applicable to the 22 machines fitted… in accordance with amendments dated 3/8/39 and 21/9/39.”

from another document in this file, date unrecorded: (all had alteration No.36 to provide armour protection for pilot) aircraft fitted with Rotols:
[Note: all delivered to 54 Sqn except as noted:]

N3030 [to 19 Sqn 3/10/39, then to 54 10/1/40]
N3096
N3097
N3103
N3104
N3110
N3111
N3122
N3124
N3130
N3160
N3171 [to AMDP charge, to Boscombe 19/3/40 for comparative trials]
N3172
N3173
N3174
N3176
N3180
N3183
N3184
N3185
N3187
N3188

Vickers 340 23/4/40: …ten Spitfire are to be selected… and fitted with Rotol…. The aeroplanes so fitted are urgently required for allotment to service units, and I am to request you to proceed immediately with the necessary work.
from Vickers 342 8/8/40 [re communications in May. Note these aircraft not delivered until July- I assume they are the same 10, but don’t know for sure. Most went to 54, but a number to 609 and other squadrons]
selected for fitment of specially modified Merlin III and Rotol
R6977
R6979
R6981
R6993
R6995
R7015
R7017
R7019
R7020
R7021

Hope this helps,
Bob