The guys who stripped the kit off are Universal Salvage, that's where the cars went to be SVA'd before release. How much of it they still have I don't know. I'm planning on taking a trip up there in the near future to see what they have left, will let you know.AFAIK Safety Devices have stopped supplying the racks whilst they "consolidate" the business, not sure if this means they will start up again or not though so your only chance at the moment would be either Universal or eBay.
The lights are Warn SDB-160's but they're not cheap at around £300 a pair new. Again they come up on eBay both as new sets or as ex-G4 sets. The new ones will have the wrong brackets on them, the ex-G4 ones may have the correct brackets depending on what car they came off, the RR ones were different from the D2 ones, not sure about the 110's though. The wiring connectors were fitted by LR as was the loom used to connect them to the controller.
The winch is either a Warn XD9000i or a 9.5ti depending on which year the car was used on. Not sure where the bumper mount on the 110 came from, may well be LR themselves.
As Darren says the snorkel, underbody protection and interior racks are all supplied by Mantec. These do come up eBay occasionally so worth keeping an eye out for, failing that a trip to Mantec in Nuneaton may be in order.
I'm not sure what the towing hitch on the 110's was, as Darren says the D2's had NAS spec hitches but the 110 will be different
That little lot should get you started, once you've got that lot the obsession will have kicked in and you'll be on eBay all hours the day buying G4 related stuff, or is that just me:w00t: