After reading the sleeve notes for “Lots of oil” on Yelp! by the Mrs Ackroyd Band I went looking for the letter of T.E. Lawrence to The Times in July 1920 that is mentioned. It appears an archive of his papers is available at http://telawrence.net/ with the texts of his out-of-copyright writings available and in that I found his letter to the editor, The Times, 22 July 1920. I also found a later editorial in the Sunday Times (22 August 1920) which has a rather topical quote:

The people of England have been led in Mesopotamia into a trap from which it will be hard to escape with dignity and honour. They have been tricked into it by a steady withholding of information. The Bagdad communiqués are belated, insincere, incomplete. Things have been far worse than we have been told, our administration more bloody and inefficient than the public knows. It is a disgrace to our imperial record, and may soon be too inflamed for any ordinary cure. We are to-day not far from a disaster.