What should I be paying?
It's not cheap, especially if you want the characteristic equipment. For the matrix headlamps, watchstrap leather, head-up display and most (but not all) of the available driver assist, you're into the Ultra Prestige level, at £31k.
Still, the 100bhp manual does kick off at £21,550, and if you don't mind old-skool filament headlights, there is at least CarPlay and Android Auto to bring your own comms and nav.
The mpg figures hover around mid to high 40s mpg for the petrol cars, and they're WLTP. Not at all bad.
If you don't want to pay for fuel, wait for the electric version. The aim is that combustion and electric are born equal: same looks, same room inside, same equipment, much the same performance. Even the same cost to own – the EV will cost more to buy or lease, but less to run.
The bigger DS 7 didn't take off very fast in the UK because the dealers are a long way apart. DS aims to counteract that giving the option of bringing the new car to you and taking your old away, and doing similar valet service too. Other concierge services, and access to food and cultural events, are coming on stream.