A credit-card sized computer designed to help teach children to code has gone on sale for the first time.
The Raspberry Pi is a bare-bones, low-cost computer created by volunteers mostly drawn from academia and the UK tech industry.
Sold uncased without keyboard or monitor, the Pi has drawn interest from educators and enthusiasts.
Supporters hope the machines could help reverse a lack of programming skills in the UK.
"It has been six years in the making; the number of things that had to go right for this to happen is enormous. I couldn’t be more pleased," said Eben Upton of the Raspberry Pi Foundation which is based in Cambridge.
Massive demand for the computer has caused the website of one supplier, Leeds-based Premier Farnell, to crash under the weight of heavy traffic.