New £24,275 offering is the first car of its type and size in the UK
300PS S3 Sportback first vehicle to boast super-fast connectivity as Audi pounce on London 4G revolution
Priced between £24,375 and £30,055, vehicle is on sale now for September deliveries
The A3, now in its third generation, started life 17 years ago
First ever 'three-box' A3 variant priced from £24,275