Flight surgeons reported that the men who had been at jungle airfields longest were in bad shape:

Many have chronic dysentery or other disease, and almost all show chronic fatigue states. … They appear listless, unkempt, careless, and apathetic with almost mask-like facial expression. Speech is slow, thought content is poor, they complain of chronic headaches, insomnia, memory defect, feel forgotten, worry about themselves, are afraid of new assignments, have no sense of responsibility, and are hopeless about the future. British
Unlike the Americans, the British leaders firmly held the lessons of World War I. It was estimated that aerial bombardment would kill up to 35,000 a day, but the Blitz killed only 40,000 in total. The expected torrent of civilian mental breakdown did not occur. The Government turned to World War I doctors for advice on those who did have problems. The PIE principles were generally used. However, in the British Army, since most of the World War I doctors were too old for the job, young, analytically trained psychiatrists were employed. Army doctors "appeared to have no conception of breakdown in war and its treatment, though many of them had served in the 1914–1918 war." The first Middle East Force psychiatric hospital was set up in 1942. With D-Day for the first month there was a policy of holding casualties for only 48 hours before they were sent back over the Channel.
Recommendations from this included:

In forward areas
No soldier should be allowed to think that loss of nervous or mental control provides an honorable avenue of escape from the battlefield, and every endeavor should be made to prevent slight cases leaving the battalion or divisional area, where treatment should be confined to provision of rest and comfort for those who need it and to heartening them for return to the front line. In neurological centers
When cases are sufficiently severe to necessitate more scientific and elaborate treatment they should be sent to special Neurological Centers as near the front as possible, to be under the care of an expert in nervous disorders. No such case should, however, be so labelled on evacuation as to fix the idea of nervous breakdown in the patients mind. In base hospitals
When evacuation to the base hospital is necessary, cases should be treated in a separate hospital or separate sections of a hospital, and not with the ordinary sick and wounded patients. Only in exceptional circumstances should cases be sent to the United Kingdom, as, for instance, men likely to be unfit for further service of any kind with the forces in the field. This policy should be widely known throughout the Force. Forms of treatment
The establishment of an atmosphere of cure is the basis of all successful treatment, the personality of the physician is, therefore, of the greatest importance.