Believe me, if you ring them up saying you want an hour's flight, they'll happily take your money and give you an hour's flight! Besides, what you really want is a lesson, rather than what gets labelled as a "trial flight" to sell as a birthday present for dad's 50th etc. Tell 'em you're planning to do your PPL and they'll probably run it as Lesson 1, so you get to do some real stuff, possibly even the take-off.
Yeah, don't bother with the "experience" companies.
I'm getting quite excited for you myself - it's all bringing back my first flight a few years ago!
