00,
many moons ago I was talking with an engineer whose job it was to assess industry invoices. He challenged one from Hawker Siddley, as it was then, for an extortionate sum to provide and fit a settee to the Royal Flight Andover.
The invoice duly came back "To source and procure from Harrods one settee - £1000. To submit same to HS stress engineers - £4000"
This was then queried, "and what did they have to do to make it secure."
"Nothing it was strong enough to have the hooks."