Burnes was to live a great deal of his life camped in tents, and it is important to have an idea of what these camps looked like. British officers generally had large, individual tents. These would normally be taken on by bearers and pitched a day’s march ahead, ready for the officers’ arrival in the evening. Their escort and servants would have numerous tents around them. The camp would be very diffuse, as men of differing castes could not share a tent together or cook their food together. The campfires were therefore numerous and small. Horses and baggage animals would be pegged or coralled just on the margin of the camp.

The kind of tent which Burnes slept in would have been large and complex. It would have had both an inner and an outer tent; valets and bodyguards were sometimes allowed to sleep in the space between. At the entrance and ventilation points would be hung additional cloth screens called tatties, which were kept soaked in hot weather to provide cooling through evaporation. In very hot weather the British normally sunk a pit under the tent. The floor was covered with rich carpet.

Burnes has not left a description of any of his tents, but a contemporary traveller in India, Charles Hugel, had a tent with poles 25 feet high – the size of a British telegraph pole. The outer roof alone of Hugel’s tent weighed 600 lbs, and the fabric needed 6 horses to carry it.1

Hugel was not an army officer, but military tents appear also to have been very large. William Hough wrote that when a Regiment’s tents were brought down by a storm, sleeping officers were in danger of being killed by falling tent poles – which indicates that, like Hugel’s, these were very substantial. There are numerous references throughout this period to the marches of armies being delayed by heavy rain, because when wet the tents were simply too heavy to be lifted by the draught animals.

I give this detail because my own mental picture of Burnes in his tent and camp had been quite wrong.

One reason my book on BUrnes still is not finished is that I am absolutely fascinated by the detail. The above is riveting compared to some of the sections I have written on how Burnes had to account for his expenses. But I love to learn the process. I fear that the number of people who are as interested as me by this, or by how precisely a letter got from Montrose to Dera Ghazi Khan in 1837 and how the revenue was split, is very small. Actually I struggle to explain why this degree of authenticity is so important to me. It is not that I have not written screeds on the broad sweep of imperial expansion and its drivers. I have. I just have a constant urge to recreate a realistic sense of how it was to live in the world I am describing.

Maybe I need to do novels?

The FCO claim that records of extraordinary rendition flights to Diego Garcia were destroyed by water damage is an insult to all our intelligence. The FCO is refusing to say where the records were at the time, or what else was damaged in the (presumed) flood. This is of a piece with, but much more serious than, the “accidental” shredding of all Tony Blair’s parliamentary expenses claims. It is not that they expect us to believe them – they just don’t care. They have the power, and we don’t.

Just as much an insult to our intelligence is the new scheme of security measures at airports. These are all to do with maintaining the fear levels that keep the population compliant, and nothing to do with aviation security. If you have some kind of bomb inside an electronic device, you need a power source to trigger it. The last thing a bomber wants is a flat battery.

It is over twenty years now since I went on a MI6/SAS hosted course at “the Fort” near Gosport. One of the things we were shown and had explained to us, was a laptop which had been converted into a very effective bomb incorporating a slim sheet of semtex. That laptop could switch on and work absolutely normally. The laptop battery was the power source for the detonator.

Explosives detectors at airports would today pick up the semtex. That a mobile phone with no power source could be a bomb, in a way not immediately spotted by x-ray or explosives detector, is a nonsense. If you want to cause real damage on a plane, buy two one litre bottles of 50% strength premium vodka in duty free and set fire to them. You would be surprised at the extreme heat that can produce in a confined space.