Hi, I have today arranged a deal with voltsport.co.uk for a little better prices on the Sevcon Gen4 controllers. That's good news for you who have a Twizy that is produced after July 2016 and wants a Powerbox.
Here's a link directly to the controller you need
Sevcon Gen4 48v 450A
When you buy a Motor Controller of Voltsport, just add in the comments that Kenneth has sent you here and you'll get a slightly better price of them
For those who have not heard anything about this yet, it's so that we can now tune the new Twizy model but you need to replace your Motor controller with either an older used controller or a new public Sevcon controller like the one I link to above .
You must then send the controller to me, so I program and prepare for you (its free because it's expensive enough to just send them :-). When you get it back from me, just mount it and connect your new Powerbox and you're done. It will be plug and play :-).
It is about 1 hour to install a controller. You will get help from me if you need and I also have a guide that shows how
Here is the guide