Retrofit Company Recomendations

I am about to Purchase a second hand A3 e-tron I am finding it impossible to find one with the spec I want, so I am looking at having the following accessories fitted.

Can anyone please recommend a company to carry out the work ?

The car currently has fitted options as well as the standard MY2017 features
· Matrix LED
· Adaptive Cruise control
· Rear parking sensors
· Milano Leather
· Folding Mirrors
· Virtual cockpit
· Interior LED Pack
· B and O sound system
· Audi Phone box
· 3 spoke multi function steering wheel

Hardware installation
· Reversing Camera
· Side Assist
· Front Parking Sensors

Software Coding for the above and the following if not already included in enabling the hardware normally
· Traffic Jam assist
· Emergency assist
· Camera based traffic sign recognition (unsure if this is standard on (in the MY2017 e-tron the brochure is unclear it is mentioned as standard in the MY2018 brochure)
· Park assist
· Audi parking system Plus (if this is not automatically part of Park assist)

Potentally
Hill hold assist

THANKS