Formerly known as Whispr, Lua has developed voice technology for frontline workers

Venture capital arm of audio equipment company and Seedcamp invest in start-up

The tech funds include a stake in fintech business Transferwise and smaller companies

The fintech start-up, which has raised more than $15m, is targeting 1m customers

Some 53,000 people from 167 countries expected to attend Lisbon conference

It is difficult to win a place on them, but they are worth it if you get selected