Stapleford (USA) is a flight school and is located at Richard L Jones Jnr (Riverside) Airport, 203 Cessna Drive, Tulsa. Oklahoma 74132 tel 918 298 3164.
My interpretation is that if an instrument rating is added to a PPL for private flying only, then the training is non-vocational.
However unlike my original posting, this interpretation has not been verified by my lawyer. We will check this out if necessary.
Tony Cornish