i've done them both, pass on my 2.2 with HID mains and the drivers on my dad's with just normal bulbs
basically - with HIDS - BE VERY VERY CAREFULL! as there is a huge voltage running through the balast packs and if your sensible - you'll take the battery off and leave them for 10mins to discharge!
if you want pm me your address and i'll email you the *cough* workshop manual over
Welsh wizard just about to buy a VS not sure if it good idea after reading these posts though, had one did 36 miles and
went and clutch, is in garage being repaired luckily they had two in so I said dont want the first one will have other one which costs a bit more (53 plate 2.2dci with lower mileage) pick it up next weekend.
Could you email me copy of manual too, been on the vel satis site and registered but cannot seem to access any pdf files for electrics etc