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None really.

I have written about the liberation of the camps several times before here and here and here /u/TheTeamCubed addresses this specifically writing that while some measure were considered by the British, very little to nothing was ever implemented.

As TeamCubed mentioned this was in part due to the community of psychiatrists having their hand full with returning soldiers and POWs and also in part with the general conditions of what is known as medical liberation. I have gone into this a bit in the linked answers but it is imperative to realize that Allied soldiers who liberated camps were prfoundly shook by what they found and suddenly were in charge of thousands of malnourished and tortured people.

It was under the impression of this that Allied soldiers, those who had immediately liberated a camp, had started giving out food – the famous chocolate that killed people. One survivor of the Bergen-Belsen Camp, Joop Zwart, who was chosen to be the spokesperson of the liberated prisoners gave an account of how he perceived the situation. When the British troops under command of Captain Derrick Sington first entered the camp, Zwart asked the British officer if the troops could provide the survivors with rice in warm water as a means to get them fed. Apparently, this advise wasn't heeded by Sington because Zwart goes on to report that the British troops gave out corned beef and allowed the survivors to slaughter and cook the SS's pigs. According to Zwart:

On the day of the liberation and the night following it from four thousand up to five thousand persons died in the camp, most of them because of eating too heavy food. It has taken us days to convince the British that a lean diet was the best thing for the inmates of the camp. Finally, they agreed, but then the catastrophe had already happened. We found young Ukrainians dead with a pork chop in their hands. Others had not been able to walk more than twenty meters away from the kitchen where they ate their too savory meal. They died in the main street of the camp.

Belsen, as I will go into, turned out to be an especially difficult case in terms of medical liberation but in general this practice of giving out too heavy foods to people who could not eat them did stop with the arrival of troops that were trained as medical professionals. It was also these troops who often advised that people remain in place so that they could care for them. Because this kind of care represented a massive logistical challenge.

In Belsen, 70% of all surviving inmates would have required immediate hospitalization, which due to the circumstance that the war was still ongoing and that the liberating troops were first and foremost combat troops, not medically trained professionals, was impossible. Furthermore, in the chaos of the immediate aftermath of the liberation it was difficult to get a grasp on both the survivors as well as individual soldiers because liberating troops were on the one hand careful not to immediately use force against survivors and with individual soldiers of the liberating armies, it was hard to enforce orders which seem to mandate to be not empathetic towards the liberated prisoners.

In the Belsen case, it was on April 16, 1945 that especially requested water and food for the survivors – described as "gruel" – arrived. On April 25, six Red Cross teams arrived to take care of the survivors who had not only to contend with the war-caused shortages of everything from food to bed sheets but had to make some rather difficult choices in deciding who of the survivors was to be granted access to the limited number of medical facilities. As one nurse who arrived in June describes in letters home:

A policy was adopted that the greatest number of lives would be saved by placing those who had a reasonable chance of survival under conditions in which the natural tendency to recover would be aided by suitable feeding and prevention of further infection, with rest in bed and elementary nursing for the very sick.

It was in the end of April 1945 that teams from both UNRRA (the United Nations Relief Agency) and the Quakers arrived in Germany and started devising a standardized treatment for camp survivors. This included the development of a diet consisting of intravenous hydrolysates (a high-calorie mixture designed to enter straight into the blood stream) and a semi-liquid feed, which was also given to the former inmates in order to re-acclimatize their stomachs to more solid food and in order to be able to establish in the first place, what kind of other treatments were required for the survivors.

One of the Quakers, a medical student like many of his colleagues, wrote in his diary that the most important first issue with many of the survivors was to cure the diarrhea that plagued them. Once the diarrhea, most of the patients started regaining their strength and appetite. One week after the Quakers arrived in Belsen, the death rate was halved.

A similar pattern can be observed in other camps: In Dachau too, it took only a short period of time after the immediate liberation for UNRRA and other trained medical professionals to arrive and start the immediate treatment of survivors. Stone cites Paul A. Roy who, briefly in charge of Dachau after its liberation, set out the scale of the challenge:

We had more than 32.000 human beings on our hands who, for years, had been treated worse than animals. Our first job was their welfare. We had to nurse them back to health, and to rehabilitate them mentally. Many of them had been so completely starved that the fatty tissue surrounding their nerves had been used up, producing a kind of nervous short-circuit. They could not think consecutively. Some of them had lost their memories, and their mental reactions were very slow and childish. They were human wrecks who had to be salvaged

Roy's words describe that here an institution designed to fight a war against Germany suddenly found themselves caring for thousands of liberated former prisoners who for all intents and purposes were in the most terrible state a living human being can be in. After an initial period of problems, the Allies managed to built an infrastructure of care and help for these prisoners and despite the great strain of doing so while the war was still on, managed to do so in a rather amazing way.

In Buchenwald too, the first relief came shortly after liberation in form of the 120th Evacuation Hospital, a US Army unit which was originally specialized in treating battlefield injuries but which found itself suddenly in charge of thousands of liberated inmates. The 120th Evac was able to reduce the death rate of the first few days and within four to five days, they describe that they had

stabilized [the survivors'] eating conditions so they could feed, and we were aware that the best thing we could do was to give them whole blood, especially those who more severely impacted, that they couldn't tolerate food in the stomach; they could tolerate whole blood with some nutrients from a healthy person, which we did. We had to get blood from everybody we could. I think all of us gave some blood.

Despite all this effort on part of the Allied troops, in some cases catastrophe could not be averted and the policy of keeping former prisoners in one place was justified. In many camps, but especially Bergen-Belsen, which had been used as a camp to collect prisoners from death marches in the last weeks of Nazi rule, typhus broke out. The typhus epidemic was so severe in fact that British burnt down virtually all of Bergen-Belsen after the prisoners had been evacuated.

In the first weeks after liberation about 10.000 people died in Belsen alone from various causes without the Allies being able to help.