@Stephen Ellis
I moderate the Ambulance to camper group on Facebook. There’s quite a few examples of the LT46 there in the photos section.
One of the first things I would advise before using it on public roads is to make sure the taxation class has been changed from Ambulance to PLG or PHGV depending on the plated weight, some dishonest people sell these on to unsuspecting buyers as ved exempt, once out or service they are 100% not ved exempt anymore.
Second thing is obviously to check the plated weight on the vehicle matches the revenue weight on the V5 discrepancies occur you obviously need a C1 licence for any vehicle >3500kg.
If the vehicle still has the original Ambulance electrics these can be a bit of a pita, especially if got at by the typical decommissioning vandals that the clearance auction companies use.
Most ex Ambulances have multiple battery banks and some form of archaic crude split charge setup. Dead easy to consolidate the batteries into one bank and bin the split charge in preference to a proper b2b.
Most ex Ambulances have extra stuff causing parasitic loads especially on the chassis battery if not removed.
Lastly to date I have never ever encountered a well or properly insulated pvc ambulance work on the basis it will have sod all effective insulation usually the few bits of rock wool they lob in is better seen as crude soundproofing.
The modular bodied vans are usually a bit better insulated but not always and there’s often huge voids especially in the ceiling where it matters the most.
Hth.