Happy birthday, Speccy

It's 30 years since Sir Clive Sinclair launched his revolutionary little home computer, the ZX Spectrum.

Manic Miner.

Jet pac.

Cool games by Ultmate. Loading them in on tape, with wavy lines round the edges of the screen. Writing programmes in the computer language basic. None of your fancy pants Java. No HTML. Flash? It was then.

All driven on a computer that was 48k. That's right. 48k.

A lot of us have telephones that are 32 gigabytes. We have computers with drives that are terrabytes.

In London, it's worth visiting Churchill's War Rooms. Down there is a small room containing a desk with a telephone on it. It was Churchill's direct line to the American President.

The technology required to make this miracle possible took up the entire basement of Selfridges.