Sounds bad BS but I can say that I know the UK company who provide this service, as I have been involved with them as one of the team of telecommunications specialists working on a project with them.
Having walked around their garage and looked at the cleaning and servicing, it all looked very smart. The vehicle of choice these days is Jaguar.
I also recall an occasion when I had a stretch limo to myself. I was going from the Vista Hotel (It was part of World Trade Centre and was underneath the falling towers) and going out to EWR to come home and got the full treatment. I must say, it was a pity not to have one to share it with!!