Fuji, do you mean CPL only or CPL with FI rating.
Just for the record, I had a trial flight bought for a Chrissy prezzie a couple of years ago as my mother knew I had always wanted to fly.
Subsequently went on to obtain PPL but not with the school I took the trial flight with. How would that rate if your concerns were valid.
Would the school who sold the flight fall foul because I didn't learn with them ?