China after completing their studies. In the interview he was quoted as saying that "Britain is very proud about the number of foreign students we educate at our universities, but actually all we are doing is educating our competitors. [...] I've seen frightening examples. Bugs are even left in computers so that the information continues to be transmitted after the researchers have returned home." David Willetts, the government minister responsible for British universities, said he would thoroughly investigate the statement provided by James Dyson. He has also criticised the Chinese authorities for failing to act on patent infringements. Lobbying on copyright issues with China In December 2011, The Independent reported that Bell Pottinger executive Tim Collins had been filmed by the Bureau of Investigative Journalism saying that David Cameron had raised a copyright issue with Chinese premier Wen Jiabao on behalf of Dyson Limited "because we asked him to". Suit alleging industrial espionage on motor technology In 2012, Yong Pang, an engineer specialist in electric motors, was accused of stealing Dyson's digital motor technology which was a part of future product development projects. The motors, in development over 15 years, incorporated microchip "digital impulse technology" to spin at 104,000 rpm in order to draw high volumes of air through the appliance, and were not licensed to any other companies. Yong Pang and his wife Yali Li allegedly set up a front company "ACE Electrical Machine Design" to receive payments of £11,650 from Bosch while Pang was working for Dyson. Dyson claimed that trade secrets were passed to Bosch's Chinese motor manufacturer. Siemens and Bosch energy requirements allegations In 2015, Dyson charged that Siemens and Bosch vacuums were using a sensor that sent signals to its motor to increase its power while the machine sucked up dust remnants, making them appear more competent during European Union (EU) efficiency tests. Because tests are conducted in dust-free labs, Dyson claimed that this gave an unfair reading, because in a real home environment the machines used much more power. Dyson said both brands have "capitalized on loopholes" found within the EU regulations to be granted an AAAA energy consumption rating, when actual domestic use showed they performed similarly to an "E" or "F" rating. Dyson issued proceedings against Bosch in Netherlands and France, and against Siemens in Germany and Belgium. However, BSH's Hausgeräte, which makes household appliances under the Bosch and Siemens brands explained