For the moment, new Echo device is only available 'exclusively by invitation'
Most hit are consumers and average demand has tripled in a year to £840
Reaches 328m compared with 321.3m predicted by analysts
Collaborative partners invited for 'Interface Multiparty Competition'
Founder thought of idea as a teenager and taught himself to code
Signals 'a desire to educate and inspire,' says Angela Ahrendts
Proof-of-concept test flight took place last week
Software will comb through salesperson's email, calendar and business relationships
Members gain access to 'committed, passionate and skilled people'