The stripped-back computer was previously just manufactured in Shenzen, China, due to cost issues, but David Braben - founding trustee of the Raspberry Pi Foundation and head of games studio Frontier Developments - said in July that the goal was to shift production to the UK.
That has now been achieved after Premier Farnell, which distributes the Pi, signed a deal with Sony for 300,000 Raspberry Pis to be produced at a factory in Wales, creating 30 jobs.
UK production of the Raspberry Pi started in mid-August at Sony UK Technology's factory in Pencoed, South Wales. The move means that almost all the Pis distributed by Premier Farnell will be made in Britain.
Since its launch earlier in the year, the computer has proved a massive hit and smashed initial sales projections, with some estimating that the device will shift more than a million units before the end of the year.
In a blogpost yesterday, Raspberry Pi community director Liz Upton said that the computer was initially made in China as production in Britain was just not cost effective in the early days of the project.
"Last year, when nobody had heard of the Raspberry Pi, we had been unable to find a British manufacturer whose prices per unit (especially at a point where we were thinking of sales in the tens of thousands, not the hundreds of thousands you're seeing now) would work for us, and who believed that the project would be enough of a success for them to risk line space for us.
"There was just no way to make the Raspberry Pi in the UK and keep the price at $25 for the Model A (which will be released before the end of the year at the promised price) and $35 for the Model B. Happily, things change."
Upton said that talks with Sony started six months ago and she praised the electronics giant for its "incredibly impressive" factory in Wales.
"[The factory] is the quietest, pleasantest plant I've ever been in, all comfortable lighting, ergonomic workspaces, cool air and relaxed staff," she said.
"Sony's quality control system is legendary, their ability to manufacture fast and cleanly is superb, and they've already invested in adding PoP (Package on Package - the fiddly stuff where the Broadcom chip at the heart of the Raspberry Pi is stacked beneath the RAM chip) hardware manufacture ability and expansion capability just for us.
"They're also able to take on the huge task (currently undertaken by RS and Farnell) of ensuring the parts used are sourced ethically and to the highest ecological standards - every component has to pass standard compliance via Sony's Green Management programme."
The first UK-made Raspberry Pis are being delivered to customers this week, stamped with "Made in the UK" next to the power jack.