Transcript follows. Image from the book, Past. Present. Future. To celebrate Two Hundred Years of Publication. Huge thanks to Nigel Brachi for bringing it to my attention.

Transcript
From Lt. Col. A.D. Wintle.
The Royal Dragoons
Cavalry Club
127 Piccadilly W.1.
To the Editor of The Times.
Sir,
I have just written you a long letter.
On reading it over, I have thrown it into the waste paper basket.
Hoping this will meet with your approval,
I am
Sir
Your obedient Servant
(Signed, 'ADWintle')
6 Feb '46