I sat in the new 2008 last week, left hand drive french demo in the dealer in Epsom (also the 208 but that’s a small boy racer thing).
I’d say try the e-2008 for size before deciding on the ds-3 e-tense, they have the same underpinnings & drivetrain, so the only variation will be from the slight differences in aerodynamic efficiencies. Boot size of the e-2008 was OK for a small SUV.
The e-2008 is supposed to come to motability on the 20th February, dealer couldn’t slip me the price as they said they didn’t know it yet.