tokens: He was Principal Investigator ( PI ) of the £ 6 m EPSRC INTelligent Energy awaRe NETworks ( INTERNET ) Programme Grant , 2010 - 2016 and is currently PI of the £ 6.6 m EPSRC Terabit Bidirectional Multi - user Optical Wireless System ( TOWS ) for 6 G LiFi Programme Grant , 2019 - 2024 .