i had similar when i mot's me bug last year, all was ok, but she was that low when she went to go on the brake test rollers the front beam bottomed out and the wheels werent even touching the rollers!! lol, so the geezer took some oldy worldy kinda compass/spirit level type thing on the passenger floor whilst he took for a spin, this equipment was used before 'rollers' were in force so i take it the garage you went to hasnt got any of the old kit for emergencey situation or there just being tw@ts!!
90mm aint to bad, me bug was 1" off the floor!!!
