One of the greatest inventions, IMHO of the 21st Century. I have 2 of them sitting next to me, one with a touch-screen on it, one with HiFi stereo hat. And a Pi Zero running the front-door camera. About the only thing comparable in terms of ready computability is the Arduino, but being Italian, I don't think it's a major priority for the Royal Mail.
Please don't tell me that £1.50 is standard First Class postage, though. The USA just went up to 50¢.
Incidentally, they've now managed to produce superconductors that operate at 40°F/4°C. Should be about good for Brighton in August. Now if they can just come up with a way to produce the material without exerting so much pressure that diamond anvils won't crack.
Sources may include data from the Fakebook Research Foundation with support from Gargle University