Jojoe, they control regen but you have to be in D mode, the left – paddle increases it in increments 1,2,3,Auto, the right + paddle decreases it back down.
In D mode when you take your foot off the accelerator the car barely slows down as no regen is applied (without using the paddles) in B mode (mainly for start/stop around town or in queues) taking your foot off the car is in Auto regen(large blue A next to the drive mode display) and slows a lot faster putting more charge back into the battery.
I haven’t found any difference in my consumption/efficiency it’s still around 3.3kWh. I’ve been driving in B mode for the last 6 months but just did a 2 week trial using D mode and there’s no improvement that I can find but that’s probably due to my driving conditions of mainly short jourmeys.
Don’t know if it’s because we are right hand drive and the paddles are switched over or it means less or more use of battery!
Please excuse spelling/typos. Apart from being a clot it turns out I had one on my cerebellum that's now causing various problems!