A charity making cheap educational computers has been forced to delay the shipment of its first batch after the Chinese manufacturers made a crucial error in production.

Liz Upton, Raspberry Pi’s spokeswoman explained on the charity's blog that “where we’d specified jacks with integrated magnetics in the BOM and schematics, the factory soldered in non-magnetic jacks. No magnetics means no network connection.”

The factory now needs to de-solder the jacks and solder on new ones before it can send out the first batch of computers.

Eben Upton, founder of the projects, previously explained to civilsociety.co.uk that the charity decided to manufacture the computers in China instead of the UK  because the Chinese factory could commit to making the product more cheaply and with a 12-week turn-around time.

All 11,000 devices in the first batch have been pre-sold since going on sale on 29 February.