The outbreak of sunshine was something of a metaphor for how things are panning out for the California co-founder of G24 Innovations (G24i), who, after six years developing his wafer-thin dye-sensitised solar cell (DSSC) technology at a factory in Wales, has finally achieved commercial breakthrough.

The day before, he had inked a deal with computer peripherals company Logitech for G24i solar cells to power the keyboard and the Bluetooth technology that connects it to the Apple