@EricM that's your prerogative but that's wasting your time and theirs. It is how it is, it may be different from your previous car but that's how different manufacturers have configured their vehicles.I intend to report the experience as a fault to be sorted out under warranty and look forward to service department trying to explain the symptoms.
Afterthought : I've yet to try cruise control but does anyone know if this unnecessary recuperative braking happens as you go up & down motorway 'hills' ? I'll no doubt investigate that on my next outing.
It does regenerative braking if you are going down an incline on the motorway and you are likely to exceed your set speed. Its what cruise control does. Not sure what you are expecting.