i would tend to agree with tony but with the shocks being newish after adjusting level arm i would say it would be fine ! if you are fancying track days mabye not but for genaral driving 
Thanks Markey, i hope there will be track days, but they def be on a bike, so the car is safe. :-)
To confirm, with help from Kevin Wood, i was able to supply the dealer with an 03 Mv6 3.2 reg number!
Similar spec to my car.And simply asked for a Quote on shocks and springs all round with self levelling option, then a price on rear shocks and springs for mine.
Having picked myself up off the floor from seeing the £1300 plus price, i was pleased to see that part numbers for rear shocks and springs with sl for Kevins mv6 would be exactly the same as my Elite!!!
This is great news as i can now fit mv6 front end and just lower the rear ride hight to match the front. So i dont even need mv6 rear springs. All i need now is a pair of mv6 front shocks at £46 odd on tc. And source a pair of non vx springs of the same mv6 spec for the front. Job done.
Although i think i should ring Tony at wim and check the book ride hight for both vehicles.
And i wonder if vx do a shorter tie rod for the self levelling arm on the mv6? Hmmm.
Having fitted a tow bar and will be fitting an lpg donut tank the spare wheel well, i wonder if keeping sl might be wise, esp when towing, with all the extra heft on the back?