Not careful means tolerating bad bugs – a gram of faeces can carry 1m bacteria and 10m viruses – on banknotes, phones, tube train rails, everywhere, because we are too lazy to cleanse properly.
For five days, we will trade the febrile world of cappuccinos, mobile phones, crowded tubes and traffic jams for that of paraffin lamps, Land Rovers and 12-seater planes, temperatures of 30C, luxurious tents and dawn game drives.
But we were about to bring them into contact with the outside world via mobile phones, You Tube and Facebook.
West Wing trainspotters might also enjoy the capsules with top-secret phones (nicknamed "Superman tubes" by staff) and mahogany panelling that's made from the same grain as woodwork on Air Force One and Camp David – lest the President feels homesick.
The phone is codenamed "Tube," and not a damn thing is known about it.
Frankie and June first notice each other as a snippet from "Wonderful Tonight" by Eric Clapton plays, but when Frankie saw that June had dropped her phone on the Tube, he set off to return it (communicating through her sister's phone).
Many Britons now phone, bank, travel by Tube, fly out of an airport, run a tap or flush the toilet courtesy of Spanish enterprise.
This one's just in case you have your phone beneath a metal tube that happens to drop fairly hefty ball bearings from time to time.
It took me weeks of hunting on Ebay to find this model a No. 20AL desk phone with a base, tube shaft and rotary dial in brass and a receiver and transmitter cup in black lacquer.
Among the red Lego phone booths and recreated Tube maps, visitors can also attend masterclasses with top-notch Lego builders and shop for sets on digital shopping screens.
