GPs aren't normally free-range indoors are they?
No
Things that I reckon will be mentioned on the health front ( Rabbits)
Sore Hocks from carpet burn
Ingestion of fabric/ wallpaper (wallpaper paste has fungicide added which is toxic)
Lead poisoning from nibbling skirting boards which might have some old paint on which contains lead.
Electrocution from nibbling electrical wires
Lack of exposure to natural light ( sunshine) leading to VIT D deficiencies and all the subsequent consequences on bone density and dentition.
Central heating- Rabbits are obligate nose breathers, the arid atmosphere central heating can cause can irritate the Rabbit’s nasal passages causing irritation leading to allergic rhinitis and possibly RTIs
If the home has other species of Pet- eg Dogs , Cats, - stress induced gut stasis if introductions are not carried out correctly. Injuries should something awful happen- Rabbits are a prey species, Cats and Dogs are predators.
I can see a real possibility that over time the Rabbit Welfare message will gravitate to outdoor living being best.
Edit- just thought of another one- joint injuries as a result of the lack of good traction from wood/Lino/tiled flooring. Especially baby Bunnies who can sustain serious injuries from charging about on a flooring with poor traction.Hip dislocation in particular.