British Air Mail Letter Card form for Use in East Africa

One of the previous owners made this note on the reverse:

"Kenya +Uganda. Newly discovered similar to 3 MLS will be catalogued"

I have no idea which catalogue was referred to here. My reference is P. R. Adby, Aerogrammes - Air Mail Letter Card - Air Letters, 1997. This handbook is not easy to handle, but here is a shot:

• Shape A, 125 x 95 mm when folded, single top sealing flap, 1 mm blue border, no security overlay on paper
• Width of "LETTER CARD" on the top of the front panel: 50 mm
• Vertical distance M (in Air Mail, covered by the censor label) to R in "LETTER: 4.5 mm
• Affix instruction is "Stamps / must be / affixed / here", which is Adby's type A-7
• No address lines on front panel
• Blue label in top left corner, "BY AIR MAIL" in white
• red 25 cents KENYA & UGANDA imprint over the Affix instruction (partly covered by the censor label

This is Adby type F1A-3, but there is no match with the listed subtypes. The one closest is F1A-3d. The only difference is that the "25 cents .." imprint on Adby F1A-3d is in blue. The one in the copy above is in red.

I'm not aware of a more recent catalogue issue, but I have found similar copies in the "Military Aerogrammes" exhibit of Roggenkämper which is available online: http://www.aerogramme.com/exhibits/wwmals/ExhF2P12.htm.
Unfortunately, the scans of the exhibit pages are not very clear.